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INSTRUCTOR’S SOLUTIONS MANUAL THOMAS’ CALCULUS TWELFTH EDITION WILLIAM ARDIS Collin County Community College

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Functions 1 1.1 Functions and Their Graphs 1 1.2 Combining Functions; Shifting and Scaling Graphs 8 1.3 Trigonometric Functions 19 1.4 Graphing with Calculators and Computers 26 Practice Exercises 30 Additional and Advanced Exercises 38 2 Limits and Continuity 43 2.1 Rates of Change and Tangents to Curves 43 2.2 Limit of a Function and Limit Laws 46 2.3 The Precise Definition of a Limit 55 2.4 One-Sided Limits 63 2.5 Continuity 67 2.6 Limits Involving Infinity; Asymptotes of Graphs 73 Practice Exercises 82 Additional and Advanced Exercises 86 3 Differentiation 93 3.1 Tangents and the Derivative at a Point 93 3.2 The Derivative as a Function 99 3.3 Differentiation Rules 109 3.4 The Derivative as a Rate of Change 114 3.5 Derivatives of Trigonometric Functions 120 3.6 The Chain Rule 127 3.7 Implicit Differentiation 135 3.8 Related Rates 142 3.9 Linearizations and Differentials 146 Practice Exercises 151 Additional and Advanced Exercises 162 4 Applications of Derivatives 167 4.1 Extreme Values of Functions 167 4.2 The Mean Value Theorem 179 4.3 Monotonic Functions and the First Derivative Test 188 4.4 Concavity and Curve Sketching 196 4.5 Applied Optimization 216 4.6 Newton's Method 229 4.7 Antiderivatives 233 Practice Exercises 239 Additional and Advanced Exercises 251 5 Integration 257 5.1 Area and Estimating with Finite Sums 257 5.2 Sigma Notation and Limits of Finite Sums 262 5.3 The Definite Integral 268 5.4 The Fundamental Theorem of Calculus 282 5.5 Indefinite Integrals and the Substitution Rule 290 5.6 Substitution and Area Between Curves 296 Practice Exercises 310 Additional and Advanced Exercises 3206 Applications of Definite Integrals 327 6.1 Volumes Using Cross-Sections 327 6.2 Volumes Using Cylindrical Shells 337 6.3 Arc Lengths 347 6.4 Areas of Surfaces of Revolution 353 6.5 Work and Fluid Forces 358 6.6 Moments and Centers of Mass 365 Practice Exercises 376 Additional and Advanced Exercises 384 7 Transcendental Functions 389 7.1 Inverse Functions and Their Derivatives 389 7.2 Natural Logarithms 396 7.3 Exponential Functions 403 7.4 Exponential Change and Separable Differential Equations 414 7.5 Indeterminate Forms and L'Hopital's Rule 418 ^ 7.6 Inverse Trigonometric Functions 425 7.7 Hyperbolic Functions 436 7.8 Relative Rates of Growth 443 Practice Exercises 447 Additional and Advanced Exercises 458 8 Techniques of Integration 461 8.1 Integration by Parts 461 8.2 Trigonometric Integrals 471 8.3 Trigonometric Substitutions 478 8.4 Integration of Rational Functions by Partial Fractions 484 8.5 Integral Tables and Computer Algebra Systems 491 8.6 Numerical Integration 502 8.7 Improper Integrals 510 Practice Exercises 518 Additional and Advanced Exercises 528 9 First-Order Differential Equations 537 9.1 Solutions, Slope Fields and Euler's Method 537 9.2 First-Order Linear Equations 543 9.3 Applications 546 9.4 Graphical Solutions of Autonomous Equations 549 9.5 Systems of Equations and Phase Planes 557 Practice Exercises 562 Additional and Advanced Exercises 567 10 Infinite Sequences and Series 569 10.1 Sequences 569 10.2 Infinite Series 577 10.3 The Integral Test 583 10.4 Comparison Tests 590 10.5 The Ratio and Root Tests 597 10.6 Alternating Series, Absolute and Conditional Convergence 602 10.7 Power Series 608 10.8 Taylor and Maclaurin Series 617 10.9 Convergence of Taylor Series 621 10.10 The Binomial Series and Applications of Taylor Series 627 Practice Exercises 634 Additional and Advanced Exercises 642TABLE OF CONTENTS 10 Infinite Sequences and Series 569 10.1 Sequences 569 10.2 Infinite Series 577 10.3 The Integral Test 583 10.4 Comparison Tests 590 10.5 The Ratio and Root Tests 597 10.6 Alternating Series, Absolute and Conditional Convergence 602 10.7 Power Series 608 10.8 Taylor and Maclaurin Series 617 10.9 Convergence of Taylor Series 621 10.10 The Binomial Series and Applications of Taylor Series 627 Practice Exercises 634 Additional and Advanced Exercises 642 11 Parametric Equations and Polar Coordinates 647 11.1 Parametrizations of Plane Curves 647 11.2 Calculus with Parametric Curves 654 11.3 Polar Coordinates 662 11.4 Graphing in Polar Coordinates 667 11.5 Areas and Lengths in Polar Coordinates 674 11.6 Conic Sections 679 11.7 Conics in Polar Coordinates 689 Practice Exercises 699 Additional and Advanced Exercises 709 12 Vectors and the Geometry of Space 715 12.1 Three-Dimensional Coordinate Systems 715 12.2 Vectors 718 12.3 The Dot Product 723 12.4 The Cross Product 728 12.5 Lines and Planes in Space 734 12.6 Cylinders and Quadric Surfaces 741 Practice Exercises 746 Additional Exercises 754 13 Vector-Valued Functions and Motion in Space 759 13.1 Curves in Space and Their Tangents 759 13.2 Integrals of Vector Functions; Projectile Motion 764 13.3 Arc Length in Space 770 13.4 Curvature and Normal Vectors of a Curve 773 13.5 Tangential and Normal Components of Acceleration 778 13.6 Velocity and Acceleration in Polar Coordinates 784 Practice Exercises 785 Additional Exercises 791 Copyright © 2010 Pearson Education Inc. Publishing as Addison-Wesley.14 Partial Derivatives 795 14.1 Functions of Several Variables 795 14.2 Limits and Continuity in Higher Dimensions 804 14.3 Partial Derivatives 810 14.4 The Chain Rule 816 14.5 Directional Derivatives and Gradient Vectors 824 14.6 Tangent Planes and Differentials 829 14.7 Extreme Values and Saddle Points 836 14.8 Lagrange Multipliers 849 14.9 Taylor's Formula for Two Variables 857 14.10 Partial Derivatives with Constrained Variables 859 Practice Exercises 862 Additional Exercises 876 15 Multiple Integrals 881 15.1 Double and Iterated Integrals over Rectangles 881 15.2 Double Integrals over General Regions 882 15.3 Area by Double Integration 896 15.4 Double Integrals in Polar Form 900 15.5 Triple Integrals in Rectangular Coordinates 904 15.6 Moments and Centers of Mass 909 15.7 Triple Integrals in Cylindrical and Spherical Coordinates 914 15.8 Substitutions in Multiple Integrals 922 Practice Exercises 927 Additional Exercises 933 16 Integration in Vector Fields 939 16.1 Line Integrals 939 16.2 Vector Fields and Line Integrals; Work, Circulation, and Flux 944 16.3 Path Independence, Potential Functions, and Conservative Fields 952 16.4 Green's Theorem in the Plane 957 16.5 Surfaces and Area 963 16.6 Surface Integrals 972 16.7 Stokes's Theorem 980 16.8 The Divergence Theorem and a Unified Theory 984 Practice Exercises 989 Additional Exercises 997 Copyright © 2010 Pearson Education Inc. Publishing as Addison-Wesley.CHAPTER 1 FUNCTIONS 1.1 FUNCTIONS AND THEIR GRAPHS 1. domain ( ); range [1 ) 2. domain [0 ); range ( 1] œ _ß_ œ ß_ œ ß_ œ _ß 3. domain 2 ); y in range and y 5x 10 y can be any positive real number range ). œ Ò ß_ œ ! Ê Ê œ Ò!ß_ È 4. domain ( 0 3, ); y in range and y x 3x y can be any positive real number range ). œ _ß Ó  Ò _ œ  ! Ê Ê œ Ò!ß_ È 2 5. domain ( 3 3, ); y in range and y , now if t 3 3 t , or if t 3 œ _ß Ñ  Ð _ œ  Ê   ! Ê  !  3 t 3 t   4 4 3 t y can be any nonzero real number range 0 ). Ê   ! Ê  ! Ê Ê œ Ð_ß Ñ  Ð!ß_ 3 t 4 6. domain ( 4, 4 4, ); y in range and y , now if t t 16 , or if œ _ß %Ñ  Ð Ñ  Ð _ œ  % Ê   ! Ê  ! t 16 t 16 2   2 2 2 2 t 4 16 t 16 , or if t t 16 y can be any %   Ê  Ÿ   ! Ê  Ÿ  !  % Ê   ! Ê  ! Ê 2 2 "'   # t 16 t 16 2 2 2 2 nonzero real number range ). Ê œ Ð_ß  Ó  Ð!ß_ 1 8 7. (a) Not the graph of a function of x since it fails the vertical line test. (b) Is the graph of a function of x since any vertical line intersects the graph at most once. 8. (a) Not the graph of a function of x since it fails the vertical line test. (b) Not the graph of a function of x since it fails the vertical line test. 9. base x; (height) x height x; area is a(x) (base)(height) (x) x x ; œ œ Ê œ œ œ œ # # ˆ ‰ # # # # # x # È È È 3 3 3 " " Š ‹ 4 # perimeter is p(x) x x x 3x. œ œ 10. s side length s s d s ; and area is a s a d œ Ê œ Ê œ œ Ê œ # # # # # Èd2 " # 11. Let D diagonal length of a face of the cube and the length of an edge. Then D d and œ j œ j œ # # # D 2 3 d . The surface area is 6 2d and the volume is . # # # # # # $ $Î# œ j Ê j œ Ê j œ j œ œ j œ œ d 6d d d È3 3 3 3 3 È # # $ Š ‹ 12. The coordinates of P are x x so the slope of the line joining P to the origin is m (x 0). Thus, ˆ ‰ ß œ œ  È Èxx È"x x, x , . ˆ ‰ ˆ ‰ È œ m m " " # 13. 2x 4y 5 y x ; L x 0 y 0 x x x x x œ Ê œ  œ Ð  Ñ Ð  Ñ œ Ð Ñ œ  " " " # # 5 5 5 25 4 4 4 4 16 È 2 2 2 2 2 2 É É x x œ  œ œ É 5 5 25 20x 20x 4 2 É 2  È20x 20x 25 2  14. y x 3 y 3 x; L x 4 y 0 y 3 4 y y 1 y œ  Ê œ œ Ð  Ñ Ð  Ñ œ Ð  Ñ œ Ð  Ñ È 2 È È È 2 2 2 2 2 2 2 2 y 2y 1 y y y 1 œ  œ  È È 4 2 2 4 2 Copyright © 2010 Pearson Education, Inc. Publishing as Addison-Wesley.2 Chapter 1 Functions 15. The domain is . 16. The domain is . a b a b _ß _ _ß _ 17. The domain is . 18. The domain is . a b _ß _ Ð_ß !Ó 19. The domain is . 20. The domain is . a b a b a b a b _ß !  !ß _ _ß !  !ß _ 21. The domain is 5 5 3 3, 5 5, 22. The range is 2, 3 . a b a b _ß   Ð ß  Ó  Ò Ñ  _ Ò Ñ 23. Neither graph passes the vertical line test (a) (b

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,608070 _ISM_ThomasCalc_WeirHass_ttl.qxd:harsh_569709_ttl 9/3/09 3:11 PM Page 1




INSTRUCTOR’S
SOLUTIONS MANUAL
SINGLE VARIABLE

Collin County Community College
WILLIAM ARDIS



THOMAS’ CALCULUS
TWELFTH EDITION

BASED ON THE ORIGINAL WORK BY
George B. Thomas, Jr.
Massachusetts Institute of Technology

AS REVISED BY
Maurice D. Weir
Naval Postgraduate School

Joel Hass
University of California, Davis

,608070 _ISM_ThomasCalc_WeirHass_ttl.qxd:harsh_569709_ttl 9/3/09 3:11 PM Page 2




This work is protected by United States copyright laws and is provided solely
for the use of instructors in teaching their courses and assessing student
learning. Dissemination or sale of any part of this work (including on the
World Wide Web) will destroy the integrity of the work and is not permit-
ted. The work and materials from it should never be made available to
students except by instructors using the accompanying text in their
classes. All recipients of this work are expected to abide by these
restrictions and to honor the intended pedagogical purposes and the needs of
other instructors who rely on these materials.




The author and publisher of this book have used their best efforts in preparing this book. These efforts
include the development, research, and testing of the theories and programs to determine their
effectiveness. The author and publisher make no warranty of any kind, expressed or implied, with regard
to these programs or the documentation contained in this book. The author and publisher shall not be
liable in any event for incidental or consequential damages in connection with, or arising out of, the
furnishing, performance, or use of these programs.

Reproduced by Pearson Addison-Wesley from electronic files supplied by the author.

Copyright © 2010, 2005, 2001 Pearson Education, Inc.
Publishing as Pearson Addison-Wesley, 75 Arlington Street, Boston, MA 02116.

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or
transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise,
without the prior written permission of the publisher. Printed in the United States of America.

ISBN-13: 978-0-321-60807-9
ISBN-10: 0-321-60807-0

1 2 3 4 5 6 BB 12 11 10 09

, PREFACE TO THE INSTRUCTOR
This Instructor's Solutions Manual contains the solutions to every exercise in the 12th Edition of THOMAS' CALCULUS
by Maurice Weir and Joel Hass, including the Computer Algebra System (CAS) exercises. The corresponding Student's
Solutions Manual omits the solutions to the even-numbered exercises as well as the solutions to the CAS exercises (because
the CAS command templates would give them all away).

In addition to including the solutions to all of the new exercises in this edition of Thomas, we have carefully revised or
rewritten every solution which appeared in previous solutions manuals to ensure that each solution
ì conforms exactly to the methods, procedures and steps presented in the text
ì is mathematically correct
ì includes all of the steps necessary so a typical calculus student can follow the logical argument and algebra
ì includes a graph or figure whenever called for by the exercise, or if needed to help with the explanation
ì is formatted in an appropriate style to aid in its understanding
Every CAS exercise is solved in both the MAPLE and MATHEMATICA computer algebra systems. A template showing
an example of the CAS commands needed to execute the solution is provided for each exercise type. Similar exercises within
the text grouping require a change only in the input function or other numerical input parameters associated with the problem
(such as the interval endpoints or the number of iterations).

For more information about other resources available with Thomas' Calculus, visit http://pearsonhighered.com.

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