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Explain Solution R.D. Sharma Class 12 Chapter 18 Indefinite Integrals Exercise Multiple Choice Questions  Question 36 Maths Textbook Solution.

Answers (1)

Answer:

e^{x} \cos x+C

Given:

\int e^{x}(\cos x-\sin x) d x

Hint:

You must know the rule to integrate by parts.

Explanation:

Let I=\int e^{x}(\cos x-\sin x) d x

\begin{aligned} &=\int e^{x} \cos x d x-\int e^{x} \sin x d x \\ &=\cos x e^{x}+\int e^{x} \sin x d x-\int e^{x} \sin x d x \ldots . .\left\{\int u \cdot v d x=u \int v d x-\int \frac{d u}{d x} \int v d x d x\right\} \\ &=\cos x e^{x}+C \end{aligned}

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