CBSE Boardहिन्दी माध्यमकक्षा 12 साइन्सगणितसमाकलन2 Marks
Question
$\int \frac{e^{x}(1+x)}{\cos ^{2}\left(e^{x} x\right)} d x$ बराबर है:
✓
Answer
माना $x e^{x}=t \Rightarrow\left(x e^{x}+e^{x}\right)$ $=\frac{d t}{d x} \Rightarrow d x=\frac{d t}{e^{x}(x+1)}$ $\therefore$ $\int \frac{e^{x}(1+x)}{\cos ^{2}\left(e^{x} x\right)} d x$ $=\int \frac{e^{x}(1+x)}{\cos ^{2} t} \times \frac{d t}{e^{x}(1+x)}$ $=\int \frac{1}{\cos ^{2} t} d t$ = $∫$sec2t dt = tan t + C = tan (xex) + C
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