Calculus: Early Transcendentals (2nd Edition)

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

Chapter 7 - Integration Techniques - 7.3 Trigonometric Integrals - 7.3 Exercises: 34

Answer

\[ = \frac{2}{3}{\tan ^{\frac{3}{2}}}x + \frac{2}{7}{\tan ^{\frac{7}{2}}}x + C\]

Work Step by Step

\[\begin{gathered} \int_{}^{} {\sqrt {\tan x} {{\sec }^4}xdx} \hfill \\ \hfill \\ {\text{rewrite}}\,\,{\text{the}}\,\,{\text{integrand}} \hfill \\ \hfill \\ \int_{}^{} {\sqrt {\tan x} \,\sec {\,^2}x{{\sec }^2}xdx} \hfill \\ \hfill \\ use\,\,{\sec ^2}x = 1 + {\tan ^2}x \hfill \\ \hfill \\ = \int_{}^{} {\sqrt {\tan x} } \,\left( {1 + {{\tan }^2}x} \right){\sec ^2}xdx \hfill \\ \hfill \\ use\,\,\tan x = u\,\,\,\, \to \,\,du = {\sec ^2}xdx \hfill \\ \hfill \\ = \int_{}^{} {{u^{\frac{1}{2}}}\,\left( {1 + {u^2}} \right)du} \hfill \\ \hfill \\ multiply \hfill \\ \hfill \\ \int_{}^{} {\,\left( {{u^{\frac{1}{2}}} + {u^{\frac{5}{2}}}} \right)} \,du \hfill \\ \hfill \\ integrate \hfill \\ \hfill \\ = \frac{{{u^{\frac{3}{2}}}}}{{\frac{3}{2}}} + \frac{{{u^{\frac{7}{2}}}}}{{\frac{7}{2}}} + C \hfill \\ \hfill \\ substituting\,\,back\,\,u\, = \,\tan x \hfill \\ \hfill \\ = \frac{2}{3}{\tan ^{\frac{3}{2}}}x + \frac{2}{7}{\tan ^{\frac{7}{2}}}x + C \hfill \\ \end{gathered} \]
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