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: 6

Answer

The Maclaurin series for $f(x)=\sin(2x)$ 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 $f(x)=\sin2x$, we have the Maclaurin series as follows $$f(x)=\sin2x=2x-\frac{(2x)^3}{3!}+\frac{(2x)^5}{5!}-\frac{(2x)^7}{7!}+...$$ 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 $f(x)=\sin(2x)$ is also convergent for any value of $x$.
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