જો $\int \frac{\cos \theta}{5+7 \sin \theta-2 \cos ^2 \theta} d \theta=A \log _e|f(\theta)|+c$ (જ્યાં $c$ એ સંકલનનો અચળાંક છે),તો $\frac{f(\theta)}{A}$ શું હોઈ શકે?

  • A
    $\frac{2 \sin \theta+1}{\sin \theta+3}$
  • B
    $\frac{2 \sin \theta+1}{5(\sin \theta+3)}$
  • C
    $\frac{5(\sin \theta+3)}{2 \sin \theta+1}$
  • D
    $\frac{5(2 \sin \theta+1)}{\sin \theta+3}$

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ધારો કે $I(x) = \int \frac{(x+1)}{x(1+x e^x)^2} dx, x > 0$. જો $\lim_{x \rightarrow \infty} I(x) = 0$ હોય,તો $I(1)$ ની કિંમત શોધો.

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