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∫ E X ( Cot X − C O S E C 2 X ) D X - Mathematics

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Question

\[\int e^x \left( \cot x - {cosec}^2 x \right) dx\]
Sum
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Solution

\[\text{ Let I }= \int e^x \left( \cot x - {cosec}^2 x \right)dx\]

\[\text{ here f(x) } = \text{ cot x put e}^x f(x) = t\]

\[ f'(x) = - {cosec}^2 x\]

\[\text{ let e}^x \cot x = t\]

\[\text{  Diff   both  sides  w . r . t x }\]

\[ e^x \cot x + e^x \left( - {cosec}^2 x \right) = \frac{dt}{dx}\]

\[ \Rightarrow e^x \left( \cot x - {cosec}^2 x \right)dx = dt\]

\[ \therefore \int e^x \left( \cot x - {cosec}^2 x \right)dx = \int dt\]

\[ = t + C\]

\[ = e^x \cot x + C\]

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Chapter 19: Indefinite Integrals - Exercise 19.26 [Page 143]

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RD Sharma Mathematics [English] Class 12
Chapter 19 Indefinite Integrals
Exercise 19.26 | Q 4 | Page 143

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