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∫ E X ( Cos X − Sin X ) D X - Mathematics

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Question

\[\int e^x \left( \cos x - \sin x \right) dx\]
Sum
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Solution

\[\text{  Let I } = \int e^x \left( \cos x - \sin x \right) dx \]

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

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

\[ e^x \cdot \cos x + e^x \left( - \sin x \right) = \frac{dt}{dx} \text{ Put e}^x f\left( x \right) = t\]

\[ \Rightarrow e^x \left( \cos x - \sin x \right) dx = dt\]

\[ \therefore \int e^x \left( \cos x - \sin x \right) dx = \int dt\]

\[ \Rightarrow I = t + C\]

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

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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 1 | Page 143

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