Calculus, 10th Edition (Anton)

Published by Wiley
ISBN 10: 0-47064-772-8
ISBN 13: 978-0-47064-772-1

Chapter 2 - The Derivative - 2.6 The Chain Rule - Exercises Set 2.6 - Page 158: 28


$\dfrac{dy}{dx}=\dfrac{3}{2} [\tan(\sqrt{x})]^2 \sec^2(\sqrt{x})+\dfrac{\tan^3(\sqrt{x})}{2\sqrt{x}}$

Work Step by Step

In order to derivate this function, you have to use product rule: $\dfrac{d}{dx}(a*b)=a'b+ab'$ So let's identify a and b and derivate them $a = \sqrt{x}$ $a' = \dfrac{1}{2\sqrt{x}}$ $b =(\tan(\sqrt{x}))^3$ $b'= \dfrac{3[\tan(\sqrt{x})]^2\sec^2(\sqrt{x})}{2\sqrt{x}}$ *Note: Here you have to apply chain rule twice in order to derivate B Substitute in the formula: $\dfrac{dy}{dx} =(\dfrac{1}{2\sqrt{x}})(\tan(\sqrt{x}))^3+ (\sqrt{x})(\dfrac{3[\tan(\sqrt{x})]^2\sec^2(\sqrt{x})}{2\sqrt{x}})$ Simplify and get the answer: $\dfrac{dy}{dx}=\dfrac{3}{2} [\tan(\sqrt{x})]^2 \sec^2(\sqrt{x})+\dfrac{\tan^3(\sqrt{x})}{2\sqrt{x}}$
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