જો $\int_0^{\frac{\pi}{2}} \frac{\cot x}{\cot x + \csc x} dx = m(\pi + n)$ હોય,તો $m \cdot n$ ની કિંમત શોધો.

  • A
    $1$
  • B
    $\frac{1}{2}$
  • C
    $-\frac{1}{2}$
  • D
    $-1$

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