Calculus with Applications (10th Edition)

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

Chapter 13 - The Trigonometric Functions - 13.3 Integrals of Trigonometric Functions - 13.3 Exercises - Page 697: 16

Answer

$$ - \frac{1}{5}\cos {\left( {x + 2} \right)^5} + C$$

Work Step by Step

$$\eqalign{ & \int {{{\left( {x + 2} \right)}^4}\sin {{\left( {x + 2} \right)}^5}} dx \cr & {\text{set }}u = {\left( {x + 2} \right)^5}{\text{ then }}\frac{{du}}{{dx}} = 5{\left( {x + 2} \right)^4},\,\,\,\,\,\,\,\,\frac{{du}}{{5{{\left( {x + 2} \right)}^4}}} = dx \cr & {\text{write the integrand in terms of }}u \cr & \int {{{\left( {x + 2} \right)}^4}\sin {{\left( {x + 2} \right)}^5}} dx = \int {{{\left( {x + 2} \right)}^4}\sin u} \left( {\frac{{du}}{{5{{\left( {x + 2} \right)}^4}}}} \right) \cr & {\text{cancel the common factors}} \cr & = \int {\sin u} \left( {\frac{{du}}{5}} \right) \cr & = \frac{1}{5}\int {\sin u} du \cr & {\text{integrate by using the Basic Trigonometric integral }}\int {\sin x} dx = - \cos x + C \cr & = - \frac{1}{5}\cos u + C \cr & {\text{write in terms of }}x \cr & = - \frac{1}{5}\cos {\left( {x + 2} \right)^5} + C \cr} $$
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