यदि $\int \frac{\cos ^3 x}{\sin ^2 x+\sin ^4 x} d x=c-\operatorname{cosec} x-f(x)$ है,तो $f\left(\frac{\pi}{2}\right)=$

  • A
    $1$
  • B
    $0$
  • C
    $\frac{\pi}{2}$
  • D
    $\pi$

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