Calculus: Early Transcendentals 8th Edition

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

Chapter 5 - Section 5.5 - The Substitution Rule - 5.5 Exercises - Page 419: 74

Answer

$0 \leq \int_{-2}^{3}sin~\sqrt[3] {x} \leq 1$

Work Step by Step

For all real numbers $x$: $\sqrt[3] {-x} = -\sqrt[3] x$ Also: $sin~(-x) = -sin~x$ Therefore: $sin~\sqrt[3] {-x} = sin~(-\sqrt[3] {x}) = -sin~\sqrt[3] {x}$ We can see that $~~f(x) = sin \sqrt[3] {x}~~$ is an odd function. Therefore: $\int_{-2}^{2} sin \sqrt[3] {x} = 0$ Then: $\int_{-2}^{3} sin \sqrt[3] {x} = \int_{-2}^{2} sin \sqrt[3] {x}+\int_{2}^{3} sin \sqrt[3] {x} = 0+\int_{2}^{3} sin \sqrt[3] {x}$ On the interval $2 \leq x \leq 3$: $0 \leq \sqrt[3] {x} \leq \frac{\pi}{2}$ $0 \leq sin~\sqrt[3] {x} \leq 1$ Therefore: $(0)(3-2) \leq \int_{2}^{3}sin~\sqrt[3] {x} \leq (1)(3-2)$ $0 \leq \int_{2}^{3}sin~\sqrt[3] {x} \leq 1$ $0 \leq \int_{-2}^{3}sin~\sqrt[3] {x} \leq 1$
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