જો $\int \frac{\sin \theta}{\sin 3 \theta} d \theta = \frac{1}{2 k} \log \left|\frac{k+\tan \theta}{k-\tan \theta}\right|+c$ હોય,તો $k=$

  • A
    $\sqrt{3}$
  • B
    $\sqrt{2}$
  • C
    $\sqrt{7}$
  • D
    $\sqrt{5}$

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

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$\int {\sqrt {{x^2} + {a^2}} \,dx} $ ની કિંમત શોધો.

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