Calculus: Early Transcendentals (2nd Edition)

Published by Pearson
ISBN 10: 0321947347
ISBN 13: 978-0-32194-734-5

Chapter 3 - Derivatives - 3.7 The Chain Rule - 3.7 Exercises: 16

Answer

\[ = \frac{{\cos \frac{x}{4}}}{4}\]

Work Step by Step

\[\begin{gathered} y = \sin \frac{x}{4} \hfill \\ \hfill \\ y = f\,\left( u \right) = \sin u \hfill \\ \hfill \\ set\,\,u = g\,\left( x \right) = \frac{x}{4} \hfill \\ \hfill \\ Use\,\,the\,\,version\,\,1\,\,of\,\,the\,\,chain\,\,rule \hfill \\ \hfill \\ {\text{ }}\frac{{dy}}{{dx}} = \frac{{dy}}{{du}} \cdot \frac{{du}}{{dx}} \hfill \\ \hfill \\ Therefore \hfill \\ \hfill \\ \,\frac{{dy}}{{dx}} = \frac{d}{{du}}\,\left( {\sin u} \right) \cdot \frac{d}{{dx}}\,\left( {\frac{x}{4}} \right) \hfill \\ \hfill \\ then \hfill \\ \hfill \\ = \cos u \cdot \frac{1}{4} \hfill \\ \hfill \\ = \frac{{\cos \frac{x}{4}}}{4} \hfill \\ \hfill \\ \end{gathered} \]
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