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  • Please solve RD Sharma class 12 chapter Differentiation exercise 10.2 question 21 maths textbook solution

Please solve RD Sharma class 12 chapter Differentiation exercise 10.2 question 21 maths textbook solution

Answers (1)

Answer: e^{3 x} \cos 2 x

Hint: You must know the rules of solving exponential and trigonometric functions.

Given: e^{3 x} \cos 2 x

Solution:

Let  y=e^{3 x} \cos 2 x

Differentiating with respect to x

\frac{d y}{d x}=\frac{d}{d x} e^{3 x} \cos 2 x

\frac{d y}{d x}=e^{3 x} \times \frac{d}{d x}(\cos 2 x)+\cos 2 x \frac{d}{d x}\left(e^{3 x}\right)

\frac{d y}{d x}=e^{3 x} \times(-\sin 2 x) \frac{d}{d x}(2 x)+\cos 2 x e^{3 x} \frac{d}{d x}(3 x)

\begin{aligned} &\frac{d y}{d x}=-2 e^{3 x} \sin 2 x+3 e^{3 x} \cos 2 x \\ &\frac{d y}{d x}=e^{3 x}[3 \cos 2 x-2 \sin 2 x] \end{aligned}

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