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∫ Tan X √ Cos X D X - Mathematics

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Question

\[\int\frac{\tan x}{\sqrt{\cos x}} dx\]
Sum
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Solution

\[\int\frac{\tan x}{\sqrt{\cos x}}dx\]
\[ \Rightarrow \int\frac{\sin x}{\cos x \sqrt{\cos x}} dx\]
\[ \Rightarrow \int\frac{\sin x}{\cos {}^\frac{3}{2} x}dx\]
\[Let \cos x = t\]
\[ \Rightarrow - \text{sin x dx }= dt\]
\[ \Rightarrow \sin x = - \frac{dt}{dx}\]
\[Now, \int\frac{\sin x}{\cos {}^\frac{3}{2} x}dx\]


\[ = \int - \frac{1}{t^\frac{3}{2}}dt\]

 


\[ = - \int t^{- \frac{3}{2}} dt\]

 


\[ = - \left[ \frac{t^{- \frac{3}{2} + 1}}{\frac{- 3}{2} + 1} \right] + C\]
\[ = \frac{2}{\sqrt{t}} + C\]
\[ = \frac{2}{\sqrt{\cos x}} + C\]

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Chapter 19: Indefinite Integrals - Exercise 19.09 [Page 58]

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RD Sharma Mathematics [English] Class 12
Chapter 19 Indefinite Integrals
Exercise 19.09 | Q 12 | Page 58

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