જો $\int \frac{\cos x}{\sqrt{4 \sin ^2 x+4 \sin x+5}} d x=\frac{1}{2} \sinh ^{-1}(f(x))+C$ હોય, તો $2 f(x)$ શોધો.

  • A
    $1+\sin x$
  • B
    $2 \sin x+1$
  • C
    $4 \sin x+1$
  • D
    $2 \sin x-\sin 4 x+2$

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