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  • Provide Solution For R.D. Sharma Maths Class 12 Chapter 18 Indefinite Integrals Exercise Multiple Choice Questions Question 22 Maths Textbook Solution.

Provide Solution For R.D. Sharma Maths Class 12 Chapter 18 Indefinite Integrals Exercise Multiple Choice Questions Question 22 Maths Textbook Solution.

Answers (1)

Answer:

\tan \left(x e^{x}\right)+C

Given:

\int \frac{e^{x}(1+x)}{\cos ^{2}\left(x e^{x}\right)} d x

Hint:

You must know about the \int \sec ^{2} x d x.

Explanation:

Let \mathrm{I}=\int \frac{e^{x}(1+x)}{\cos ^{2}\left(x e^{x}\right)} d x

         =\int \frac{d t}{\cos ^{2} t}                                                            \text { [ Put } \left.x e^{x}=t \Rightarrow\left(x e^{x}+e^{x}(1)\right) d x=d t \Rightarrow e^{x}(x+1) d x=d t\right]

         =\int \sec ^{2} t d t                                                              \left[\because \sec \theta=\frac{1}{\cos \theta}\right]          

        \begin{aligned} &=\tan t+C \\ &=\tan \left(x e^{x}\right)+C \end{aligned}

Hence,\int \frac{e^{x}(1+x) d x}{\cos ^{2}\left(x e^{x}\right)}=\tan \left(x e^{x}\right)+C

 

Posted by

infoexpert21

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