Calculus (3rd Edition)

Published by W. H. Freeman
ISBN 10: 1464125260
ISBN 13: 978-1-46412-526-3

Chapter 11 - Infinite Series - 11.7 Taylor Series - Exercises - Page 588: 7

Answer

The Maclaurin series for $f(x)=\sin(x^2)$ is convergent for any value of $x$.

Work Step by Step

By making use of Table 2, we have the Maclaurin series for $f(x)=\sin x$ as follows $$f(x)=x-\frac{x^3}{3!}+\frac{x^5}{5!}-\frac{x^7}{7!}+...$$ Now by the comparison with the function $f(x)=\sin x^2$, we have the Maclaurin series as follows $$f(x)=\sin x^2= x^2-\frac{(x^2)^3}{3!}+\frac{(x^2)^5}{5!}-\frac{(x^2)^7}{7!}+...\\ =x^2-\frac{x^6}{3!}+\frac{x^{10}}{5!}-\frac{x^{14}}{7!}+...$$ Moreover, again from Table 2, the Maclaurin series for $f(x)=\sin x$ is convergent for any value of $x$. Hence the Maclaurin series for $f(x)=\sin(x^2)$ is also convergent for any value of $x$.
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