Ap calculus bc 2017 free response - AP® CALCULUS BC 2017 SCORING COMMENTARY. Question 2. Overview. In this problem a polar graph is supplied for the curves f(θ)=1 +sin θcos(2θ)and g(θ)=2cos θ for 0 ≤θ≤ π 2 . Regions R, bounded by the graph of r=f(θ)and the x-axis, and region S, bounded by the graphs of r=f(θ), r=g(θ), and the x-axis, are identified on the graph.

 
May 12, 2017 ... 2017 AP Calculus AB Exam Free Response Question #6 Calculating derivatives from tables, equations, and graphs. Slope of tangent line with .... Indo nepali grocery

The best way to prepare for the AP Calculus BC exam is to practice. Practice with realistic questions, review the content you miss, and become familiar with the free-response question rubric. One of the best ways to ensure you do well on the exam is to use UWorld's QBank for AP Calculus BC as your practice and preparation resource.Ap Calculus Free Response 2017 Apex AP Calculus AB Kaplan Educational Center Staff 2001-04 This essential guide to the AP Calculus AB exam offers a full ... Cracking the AP Calculus BC Exam, 2015 Edition Princeton Review 2014-10-28 EVERYTHING YOU NEED TO SCORE A PERFECT 5. Equip yourself to ace the AP Calculus BC Exam withFree Response Set #17. Free Response Set #18. A graphing calculator is required for some problems or parts of problems. Let R be the region in the first and second quadrants bounded above by the graph of 20. y and below by the horizontal line y 2 . Find the area of R. The region R is the base of a solid.2017 AP ® CALCULUS BC FREE-RESPONSE QUESTIONS 3 fx = 2 2 x −7 x +5 3 2 1 = − 2 x 2 −7 x +5 2 x −5 x −1 ∞ ∑ 2 3 n =5 2 n −7 n +5 5. Let f be the function defined by. (a) …FREE-RESPONSE SOLUTIONS ~ 2015 AB 7 Question AB-5 (a) f has a relative maximum at x = –2, because f ′(x) changes sign from positive to negative there. (b) For the graph of f to be concave down, f ′ must be decreasing.AP® Calculus BC 2010 Free-Response Questions The College Board The College Board is a not-for-profit membership association whose mission is to connect students to college success and opportunity. Founded in 1900, the College Board is composed of more than 5,700 schools, colleges, universities and other educational organizations.May 11, 2022 ... 2022 AP Calculus AB & AP Calculus BC Exam Free Response Question #3 Full playlist: ...2017 AP Calculus BC Free Response #5 - YouTube. Tom Cochran Life is a PiWay. 1.17K subscribers. Like. 1.9K views 6 years ago 2017 AP Calculus BC Free …2018 AP Calculus AB & BC Free Response Question #3. 2018 AP Calculus AB & BC Free Response Question #3. AP Calculus.May 12, 2017 · 2017 AP Calculus BC Exam Free Response Question #6Series question! Using Taylor’s formula to find Maclaurin series. Finding nth term (general term) of a se... May 7, 2021 ... 2021 AP Calculus BC Free Response Question #2. 1.2K views · 2 years ago ...more. Tom Cochran Life is a PiWay. 1.24K.Turns out getting to the patient is more expensive than curing them. The World Health Organization reportedly spent more money last year on traveling around the globe, than they di...AP® Calculus BC 2002 Free-Response Questions. The materials included in these files are intended for use by AP teachers for course and exam preparation in the classroom; permission for any other use must be sought from the Advanced Placement Program®. Teachers may reproduce them, in whole or in part, in limited quantities, for face-to-face ...AP Calculus BC Free-Response Sample Questions. Fortunately, there are many more official free-response Calc BC questions available, so you'll have a lot to practice with. The College Board has released free-response questions from 1998 to 2019. That's over twenty years worth of free-response questions!This is a PDF package of the official AP Calculus BC 2021 full Exam, complete with all sections including: 1. SECTION I: Multiple Choice Part A 2. SECTION II: FREE RESPONSE 3. Answer Key You can obtain full PDF package of the official AP Calculus BC 2021 full exam here. Below is a preview of each sections SECTION I: MULTIPLE CHOICE SECTION II: FREE RESPONSE Collection of all official Calculus ...Scoring notes: • The response must be a definite integral with correct lower and upper limits to earn this point. 5 5 • Because A ( t) = A ( t ) for 1 ≤ t ≤ 5, a response of ∫ 450 sin ( 0.62t ) dt or ∫ A ( t ) dt earns the. 1 1. point. A response missing dt or using dx is eligible to earn the point.AP Calculus. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday TicketWalkthrough of the 2017 AP Calculus BC FRQ #2Thanks for watching the video. I have a lot more free problem solving videos on my website for AP Calculus as we...(Sorry about the poor video quality. A better version is available here: https://youtu.be/V85icb7emdU)In this video, we go over the 2017 AP Calculus BC Free...AP ® CALCULUS AB FREE-RESPONSE QUESTIONS . 4. The height of a tree at time . t . is given by a twice-differentiable function . H, where . Ht ()is measured in meters . and . t . is measured in years. Selected values of ... Free-Response Questions from the 2018 AP Calculus AB Exam Created Date: 2/7/2017 4:23:19 PM ...CALCULUS BC SECTION II, Part A. Time—30 minutes Number of problems—2. A graphing calculator is required for these problems. 1. At time t, a particle moving in the xy-plane is at position ( x ( t ) , y ( t ) ) , where x ( t ) and y ( t ) are not explicitly ≥ dx = + dy given. For t 0, 4 t 1 and = sin ( t 2 ) .2017 RELEASED FREE RESPONSE SOLUTIONS – MR. CALCULUS 2017 AB/BC #1 (calculator-active) (a) Volume=A(h)dh 0 ... 5/14/2017 5:11:20 PM ..."The 2021 AP Calculus AB free-response questions are now available. https://t.co/TT2D2M8WaS"AP® Calculus BC 2010 Free-Response Questions The College Board The College Board is a not-for-profit membership association whose mission is to connect students to college success and opportunity. Founded in 1900, the College Board is composed of more than 5,700 schools, colleges, universities and other educational organizations.The AP Calculus BC Exam has consistent question types, weighting, and scoring guidelines every year, so you and your students know what to expect on exam day. Section I: Multiple Choice. 45 Questions | 1 Hour 45 minutes | 50% of Exam Score. Part A: 30 questions; 60 minutes (calculator not permitted). Part B: 15 questions; 45 minutes (graphing ... Download free-response questions from past exams along with scoring guidelines, sample responses from exam takers, and scoring distributions. If you are using assistive technology and need help accessing these PDFs in another format, contact Services for Students with Disabilities at 212-713-8333 or by email at [email protected]. The ... FREE-RESPONSE SOLUTIONS ~ 2015 AB 7 Question AB-5 (a) f has a relative maximum at x = -2, because f c x changes sign from positive to negative there. (b) For the graph of f to be concave down, f c must be decreasing. For f to be decreasing, f c must be negative. These two conditions together are met on the intervals 21x and 13 x. (c) The graph of f has points of inflection at x = -1, x = 1 ...AP Calculus BC 2017 Free Response Question 1. A tank has a height of 10 feet. The area of the horizontal cross section of the tank at height h feet is given by the function A, where A (h) is measured in square feet. The function A is continuous and decreases as h increases. Selected values for A (h) are given in the table above.CALCULUS BC SECTION II, Part A. Time—30 minutes Number of problems—2. A graphing calculator is required for these problems. 1. On a certain workday, the rate, in tons per hour, at which unprocessed gravel arrives at a gravel processing plant. is modeled by G t 90.Download free-response questions from past exams along with scoring guidelines, sample responses from exam takers, and scoring distributions. If you are using assistive technology and need help accessing these PDFs in another format, contact Services for Students with Disabilities at 212-713-8333 or by email at [email protected]. The ...Scoring notes: The use of the average value formula, indicating that a = 1 and b = 5, can be presented in single or multiple steps to earn the first point. For example, the following response earns both points: ∫5 A(t ) dt = 1502.147865 , so the average value is 375.536966.AP® CALCULUS AB/CALCULUS BC 2017 SCORING GUIDELINES. V olume = ∫ 10. ( h ) dh. 0. ≈ ( 2 − ( 0 ) ⋅ A 0 ) + ( 5 − 2 ) ⋅ A ( 2 ) + ( 10 − 5 ) ⋅ A ( 5 ) = 2 ⋅ 50.3 + 3 ⋅ 14.4 + 5 ⋅ 6.5 = 176.3 cubic feet. (b) The approximation in part (a) is an overestimate because a left Riemann sum is used and A is decreasing. 10 (c) ∫ f ( h ) dh = 101.325338. 0.The following comments on the 2017 free-response questions for AP® Calculus AB and Calculus BC were written by the Chief Reader, Stephen Davis of Davidson College. They give an overview of each free-response question and of how students performed on the question, including typical student errors. General comments regarding the skills and ...AP Calculus BC 2017 Free Response Question 1. A tank has a height of 10 feet. The area of the horizontal cross section of the tank at height h feet is given by the function A, where A (h) is measured in square feet. The … Write your responses to this question only on the designated pages in the separate Free Response booklet. Write your solution to each part in the space provided for that part. 2023 College Board. 5. The graphs of the functions f and g are shown in the figure for 12. 0 £ x £ 3. It is known that g(x) =. 3 + x. for x . BuzzFeed revealing the identities of these NFT tycoons wasn't doxxing—it was journalism On Feb. 4, BuzzFeed published an article that revealed the identities of two of the most inf...Walkthrough of the 2022 AP Calculus BC FRQ #5 Join My Discord Study Server: https://discord.gg/8WGtt3r If you'd like extra resources for AP Calculus, check...Meet an AP®︎ teacher who uses AP®︎ Calculus in his classroom. 3:26. Bill Scott uses Khan Academy to teach AP®︎ Calculus at Phillips Academy in Andover, Massachusetts, and he's part of the teaching team that helped develop Khan Academy's AP®︎ lessons. Phillips Academy was one of the first schools to teach AP®︎ nearly 60 years ago.CALCULUS BC SECTION II, Part A. A graphing calculator is required for these problems. 20 1. Water is pumped into a tank at a rate modeled by W t 2000 e liters per hour for 0 t 8, where t is measured in hours. Water is removed from the tank at a rate modeled by R t liters per hour, where R is differentiable and decreasing on 0 t 8.AP® CALCULUS AB/CALCULUS BC 2017 SCORING GUIDELINES. (b) The approximation in part (a) is an overestimate because a left Riemann sum is used and A is decreasing. The volume is 101.325 cubic feet. 0 . When h = 5, the volume of water is changing at a rate of 1.694 cubic feet per minute. is 0.648. is 0.485.Download free-response questions from past AP Calculus BC exams, along with scoring guidelines, sample responses from exam takers, and scoring distributions.2022 AP Calculus BC Free Response Questions Louis A. Talman, Ph.D. Emeritus Professor of Mathematics Metropolitan State University of Denver May 13, 2022 1. We are given, e ectively, A(t) = 450 p sin(0:62t), where 0 t 10, as the rate|in vehicles per hour|at which vehicles arrive at a toll plaza, with trepresenting the time elapsed since 5 A.M.13.2. 9.7. 4.2. The following comments on the 2019 free-response questions for AP® Calculus AB and Calculus BC were written by the Chief Reader, Stephen Davis of Davidson College. They give an overview of each free-response question and of how students performed on the question, including typical student errors.In part (d) the response earned the point by providing the correct answer. AP. Calculus BC 2021 Scoring Commentary. Question 6 (continued) Sample: 6C Score: 3. The response earned 3 points: 1 point in part (a), 1 point in part (b), 1 point in part (c), and no points in part (d). In part (a) the response did not earn the first point because the ...Fundamental Theorem of Calculus to calculate the signed area of the semicircle, ∫4 f ′( x) dx = −2π , and subtracts. 0. this value from the initial condition, f ( 4 ) = 3, to obtain a value of 3 + 2π . To find f (5) a correct response would. 5. add the initial condition to the signed area ∫ f ′(x) dx = 1.2018 Bc Calculus Free Response 5 Steps to a 5: AP Calculus BC 2018 William Ma 2017-07-28 Get ready to ace your AP Calculus BC Exam with this easy-to-follow study guide 5 Steps to a 5: AP Calculus BC introduces an easy to follow, effective 5-step ... Cracking the AP Calculus AB Exam 2017, Premium Edition Princeton Review (Firm) 2016-08 Readers ...2017 AP Calculus BC Exam Free Response Question #6Series question! Using Taylor's formula to find Maclaurin series. Finding nth term (general term) of a se... In this exam: (1) Unless otherwise specified, the domain of a function f is assumed to be the set of all real numbers x for which. f (x) is a real number. (2) The inverse of a trigonometric function f may be indicated using the inverse function notation f − 1 or with the. prefix “arc” (e.g., sin−1 x = arcsin x ). -3-. AP CALCULUS AB/CALCULUS BC 2017 SCORING COMMENTARY Question 1 (continued) Score: 6 . The response earned 6 points: the units point, 2 points in part (a), 1 point in part (b), 1 point in part (c), and 1 point in part (d). The units point was earned because the units of. ft. 3. in parts (a) and (c) and. ft. 3 /minute in part (d) are all correct.Tip 1: Know How to Use Your Calculator. For Part A of AP Calculus BC free response (the first two questions of the section), you're required to use a calculator. It's not just allowed; you absolutely need a calculator to solve those questions. While it might seem obvious that you should know how to work your calculator, knowing exactly how and ...We can analyze the average AP® Calculus BC score more efficiently by considering a multi-year trend. We can refer to the AP® Student Score Distributions, released by the College Board annually. These reports show us that the mean score was 3.81 in 2014, 3.72 in 2015, 3.80 in 2016, 3.78 in 2017, 3.74 in 2018, 3.80 in 2019 and 3.84 in 2020.Problem 6 from the 2017 AP Calculus BC Exam. The problem deals with Maclaurin series.AP® Calculus BC 2006 Free-Response Questions The College Board: Connecting Students to College Success The College Board is a not-for-profit membership association whose mission is to connect students to college success and opportunity. Founded in 1900, the association is composed of more than 5,000 schools, colleges, universities, and other CALCULUS BC FREE-RESPONSE QUESTIONS. 4. Train A runs back and forth on an east-west section of railroad track. Train A’s velocity, measured in meters per minute, is given by a differentiable function v. t , where time t is measured in minutes. Selected values for. AP® CALCULUS BC 2017 SCORING COMMENTARY Question 2 Overview In this problem a polar graph is supplied for the curves f (θ)=1 +sin θcos(2θ) and g(θ)=2cos θ for 0 ≤θ≤ π 2 . Regions R, bounded by the graph of r=f (θ) and the x-axis, and region S, bounded by the graphs of r=f (θ), r=g(θ), and the x-axis, are identified on the graph.In part (a) …This 2010 AP® Calculus BC Free-Response Questions AP Test Prep is suitable for 10th - 12th Grade. What do a zoo, snow, and a moving particle have in common? The six free-response items from the 2010 AP® Calculus BC exam allow teachers and pupils see how items may show up in context. Three of the questions are from only the BC portion of the course, while the other three also appear on the AB ...Problem 1 from the 2017 AP Calculus AB and BC Exams. The problem deals with using cross sectional areas to model the volume of a tank. Part c involves the Fu...Tip 1: Know How to Use Your Calculator. For Part A of AP Calculus BC free response (the first two questions of the section), you're required to use a calculator. It's not just allowed; you absolutely need a calculator to solve those questions. While it might seem obvious that you should know how to work your calculator, knowing exactly how and ...2010 AP' CALCULUS BC FREE-RESPONSE QUESTIONS (no calculators) cos x — I for x 0 for x = O 6. The function f, defined above, has derivatives of all orders. Let g be the function defined by = + j: f(t) dr. g(x) (a) Write the first three nonzero terms and the general term of the Taylor series for cos x about x = O. Use thisIn this video, I go through the AP Calculus AB/BC Free Response question 3. This question covers ideas such as the Fundamental Theorem of Calculus, Definite ...2008 AP' CALCULUS BC FREE-RESPONSE QUESTIONS CALCULUS BC SECTION 11, Part A Time—4S minutes Number of problems—3 A graphing calculator is required for some problems or parts of problems. I Let R the region toundedbythe graphs of y sin(zx) and y — 4x, as shown in the figure above. (a) Find the area of R. (b) The horizontal line yThis video focuses on the scoring of the Free Response Question. The presentation is similar to a briefing at the AP ® Calculus Reading, but condensed. The allotment of points, common student errors and present specific scoring examples are discussed. Watch Video. Technology solutions and extensions. 2017 AP ® CALCULUS BC FREE-RESPONSE QUESTIONS CALCULUS BC SECTION II, Part B NO CALCULATOR IS ALLOWED FOR THESE QUESTIONS. 3. The function f is differentiable on the closed interval [−6, 5 ] and satisfies f (− ) 2 = 7. The graph of f ¢, the derivative of f, consists of a semicircle and three line segments, as shown in the figure above. Sample: 1C. Score: 3. The response earned 3 points: 2 points in part (a), 1 point in part (b), no points in part (c), and no points in. part (d). In part (a) the first point was earned with the definite integral 5 20 15sin t. 6 . dt, and the second. 0. point was earned with the answer 153. AP Calculus 2021 AB FRQ Solutions Louis A. Talman, Ph.D. Emeritus Professor of Mathematics Metropolitan State University of Denver May 11, 2021 1. Solution: We begin by writing r 0 = 0, r 1 = 1, r 2 = 2, r 3 = 2:5, and r 4 = 4. (a) To approximate f0(2:25) from the given data, we write2017 AP Calculus BC Sample Student Responses and Scoring Commentary Inside: • Free Response Question 4 • Scoring Guideline • Student Samples • Scoring Commentary © …Sample: 3C. Score: 3. The response earned 3 points: no points in part (a), no points in part (b), 2 points in part (c), and 1 point in part. (d). In part (a) the property of definite integrals that is required is not stated, so the first point was not earned.2017 AP ® CALCULUS AB FREE-RESPONSE QUESTIONS CALCULUS AB SECTION II, Part A Time—30 minutes Number of questions—2. A GRAPHING CALCULATOR IS REQUIRED FOR THESE QUESTIONS. 1. A tank has a height of 10 feet. The area of the horizontal cross section of the tank at height h feet is given by. the function A, where . Ah ()is measured in square ...Mike Anderson and Ovie Faruq offloaded their collection of 72 NFTs for $9.25 million this week, according to OpenSea data. Jump to Two former Barclays junk bond traders reportedly ...Ap calculus ab 2017 practice exam. AP Calculus AB. Assignments. 95% (193) 2. ... Section II: Free-Response Questions. Multiple-Choice Answer Key. Free-Response Scoring Guidelines. Scoring Worksheet. ... AP® Calculus AB/BC Exam. Regularly Scheduled Exam Date: Thursday morning, May 5, 2016 Late-Testing Exam Date: Thursday morning, May 19, 2016 ...AP Calculus. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket2019 Free-Response Questions Question Mean . Standard Deviation Number of Possible Points ; 1 5.14 ; 2.20 : 9 : 2 2.60 ; 2.23 ; 9 : 3 4.66 ; 2.51 ; 9 : 4 3.56 ... Visit the College Board on the web: collegeboard.org . CollegeBoard . Title: AP® Calculus BC Scoring Statistics 2019 Free-Response Questions Author: College Board Subject: 2019 AP ...AP Calculus BC. Sample Student Responses and Scoring Commentary. Inside: Free Response Question 1. Scoring Guideline. Student Samples. Scoring Commentary. 2017 …2018 AP ® CALCULUS BC FREE-RESPONSE QUESTIONS 4. The height of a tree at time t is given by a twice-differentiable function H, where . Ht ()is measured in meters . and t ... Free-Response Questions from the 2018 AP Calculus BC Exam Created Date: 2/7/2017 4:23:19 PM ...CALCULUS AB SECTION II, Part B. Time—45 minutes Number of problems—3. No calculator is allowed for these problems. 4. The figure above shows the graph of f , the derivative of the function f, on the closed interval 1 £ £ x 5 . The graph of f ¢ has horizontal tangent lines at x = 1 and x = 3. The function f is twice differentiable with ...Determine the x-coordinate of the point at which g has an absolute maximum on the interval - 4 £ x £ 3. Justify your answer. (c) Find all values of x on the interval - 4 < x < 3 for which the graph of g has a point of inflection. Give a reason for your answer. (d) Find the average rate of change of f on the interval - 4 £ x £ 3.May 13, 2016 ... AP Calculus BC Exam 2016 - Free Response Question #6 [Student]. 487 views · 7 years ago ...more. Try YouTube Kids. An app made just for kids.AP BC Calculus Free Response 2017. 1. A tank has a height of 10 feet. The area of the horizontal cross section of the tank at height h feet is given by the function A, where A (h) is measured in square feet. The function A is continuous and decreases as h increases. Selected values for A (h) are given in the table above.AP BC Calculus Free Response 2017. 1. A tank has a height of 10 feet. The area of the horizontal cross section of the tank at height h feet is given by the function A, where A (h) is measured in square feet. The function A is continuous and decreases as h increases. Selected values for A (h) are given in the table above.

2017 AP Calculus BC Sample Student Responses and Scoring Commentary Inside: • Free Response Question 3 ... The response earned 6 points: 3 points in part (a), no .... Marble king marbles identification

ap calculus bc 2017 free response

178. 31K views 6 years ago AP Calculus Free Response Questions. 2017 AP Calculus BC Exam Free Response Question #2 Polar question! Find polar area. …preparation for your upcoming exam ap calculus ab 2017 free response learn 2017 ap calculus ab bc 4a ... ap calculus ab and ap calculus bc sample questions web for multiple choice questions an answer key is provided in addition each free response question isMay 11, 2022 ... 2022 AP Calculus AB/BC FRQ #3. 2K views · 1 year ago ...more. MathLeagueofAmerica. 889. Subscribe. 2. Share. Save.AP Calculus Free Response Problems 2002 - current year 2002 Form A #1 [calculator allowed] 2002 Form B #1 [calculator allowed] ... 2017 - NONE WERE ON THE EXAM THIS YEAR!! (c) 0.567143 Absolute minimum value and absolute maximum value occur at the critical point orCALCULUS BC 2017 AP ® CALCULUS BC FREE-RESPONSE QUESTIONS SECTION II, Part A Time—30 minutes Number of questions—2. A GRAPHING CALCULATOR IS REQUIRED FOR THESE QUESTIONS. 1. A tank has a height of 10 feet. The area of the horizontal cross section of the tank at height h feet is given by . the function A, where . Ah ()is measured in square ... 2022 AP Calculus BC Free Response Questions Louis A. Talman, Ph.D. Emeritus Professor of Mathematics Metropolitan State University of Denver May 13, 2022 1. We are given, e ectively, A(t) = 450 p sin(0:62t), where 0 t 10, as the rate|in vehicles per hour|at which vehicles arrive at a toll plaza, with trepresenting the time elapsed since 5 A.M. CALCULUS BC 2017 AP ® CALCULUS BC FREE-RESPONSE QUESTIONS SECTION II, Part A Time—30 minutes Number of questions—2. A GRAPHING CALCULATOR IS REQUIRED FOR THESE QUESTIONS. 1. A tank has a height of 10 feet. The area of the horizontal cross section of the tank at height h feet is given by . the function A, where . Ah ()is measured in square ...2017 RELEASED FREE RESPONSE SOLUTIONS - MR. CALCULUS 2017 AB/BC #1 (calculator-active) (a) Volume=A(h)dh 0 ∫10 ≈(2−0)A(0)+(5−2)A(2)+(10−5)A(5) =2(50.3)+3(14.4)+5(6.5) ft3 or 176.3 ft3 (b) It was given that if h increases from 0 to 10 ft, then A(h) decreases on that interval. Hence theCALCULUS BC SECTION II, Part A. Time—30 minutes Number of problems—2. A graphing calculator is required for these problems. 1. On a certain workday, the rate, in tons per hour, at which unprocessed gravel arrives at a gravel processing plant. is modeled by G t 90.2019 AP ® CALCULUS BC FREE-RESPONSE QUESTIONS . CALCULUSBC SECTION II, Part B. Time—1 hour. Number of questions—4. NO CALCULATOR IS ALLOWED FOR THESE QUESTIONS. 3. The continuous function . f is defined on the closed interval . −6 £ x £5. The figure above shows a portion of . the graph of . fVideo transcript. - [Instructor] Let's now tackle part C which tells us, for T is less than 10, an alternate model for the internal temperature of the potato at time T minutes is the function G that satisfies the differential equation. The derivative of G with respect to T is equal to the negative of G minus 27 to the two third power..

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