Calculus: Early Transcendentals 8th Edition

Published by Cengage Learning
ISBN 10: 1285741552
ISBN 13: 978-1-28574-155-0

Chapter 4 - Section 4.9 - Antiderivatives - 4.9 Exercises - Page 356: 24


$F(x)=4x-3\arctan x + \frac{3\pi}{4} -4$

Work Step by Step

Note that the antiderivative of a constant is that constant multiplied by the variable. Note that $\frac{d}{dx} \arctan x=\frac{1}{1+x^2}$. Thus $$F(x)=4x-3\arctan x +C$$ Then use the given initial condition to solve for $C.$ $$0=4(1)-3\arctan 1 + C$$ $$0=4-\frac{3\pi}{4} +C$$ $$C=\frac{3\pi}{4}-4$$.
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