$\int \frac{dx}{\cos^2(x) + \sin(2x)} = $

  • A
    $\frac{1}{2} \log |1 + 2 \cos(x)| + C$
  • B
    $\frac{1}{2} \log |1 - 2 \tan(x)| + C$
  • C
    $\frac{1}{2} \log |1 + 2 \tan(x)| + C$
  • D
    $\frac{1}{2} \log |1 + 2 \cot(x)| + C$

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मान लीजिए $f(x) = \int \frac{x^2 dx}{(1 + x^2)(1 + \sqrt{1 + x^2})}$ और $f(0) = 0$ है,तो $f(1)$ का मान ज्ञात कीजिए।

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