Calculus with Applications (10th Edition)

Published by Pearson
ISBN 10: 0321749006
ISBN 13: 978-0-32174-900-0

Chapter 13 - The Trigonometric Functions - 13.2 Derivatives of Trigonometric Functions - 13.2 Exercises - Page 689: 21

Answer

$$\frac{{dy}}{{dx}} = \frac{{6\cos x}}{{{{\left( {3 - 2\sin x} \right)}^2}}}$$

Work Step by Step

$$\eqalign{ & y = \frac{{2\sin x}}{{3 - 2\sin x}} \cr & {\text{differentiate with respect to }}x \cr & \frac{{dy}}{{dx}} = {D_x}\left[ {\frac{{2\sin x}}{{3 - 2\sin x}}} \right] \cr & {\text{use the quotient rule for derivatives}} \cr & \frac{{dy}}{{dx}} = \frac{{\left( {3 - 2\sin x} \right) \cdot {D_x}\left( {2\sin x} \right) - 2\sin x \cdot {D_x}\left( {3 - 2\sin x} \right)}}{{{{\left( {3 - 2\sin x} \right)}^2}}} \cr & {\text{solve derivatives}} \cr & \frac{{dy}}{{dx}} = \frac{{\left( {3 - 2\sin x} \right)\left( {2\cos x} \right) - 2\sin x\left( { - 2\cos x} \right)}}{{{{\left( {3 - 2\sin x} \right)}^2}}} \cr & \frac{{dy}}{{dx}} = \frac{{6\cos x - 4\sin x\cos x + 4\sin x\cos x}}{{{{\left( {3 - 2\sin x} \right)}^2}}} \cr & {\text{simplifying}} \cr & \frac{{dy}}{{dx}} = \frac{{6\cos x}}{{{{\left( {3 - 2\sin x} \right)}^2}}} \cr} $$
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