Calculus (3rd Edition)

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

Chapter 3 - Differentiation - 3.5 Higher Derivatives - Exercises - Page 135: 15

Answer

$$ y''=-\frac{1}{4}s^{-3/2}+\frac{3}{4}s^{-5/2}, \quad y'''=\frac{3}{8}s^{-5/2}-\frac{15}{8}s^{-7/2}.$$

Work Step by Step

Let $ y=s^{-1/2}(s+1)$, simpilfy $ y $ as follows $$ y=s^{1/2}+s^{-1/2}.$$ Now, we get $$ y'=\frac{1}{2}s^{-1/2}-\frac{1}{2}s^{-3/2}.$$ $$ y''=-\frac{1}{4}s^{-3/2}+\frac{3}{4}s^{-5/2}, \quad y'''=\frac{3}{8}s^{-5/2}-\frac{15}{8}s^{-7/2}.$$
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