यदि $\int(1-\cos x) \operatorname{cosec}^2 x \, dx = f(x) + c$ है,तो $f(x)$ का मान क्या होगा?

  • A
    $\tan \frac{x}{2}$
  • B
    $\cot \frac{x}{2}$
  • C
    $2 \tan \frac{x}{2}$
  • D
    $\frac{1}{2} \tan \frac{x}{2}$

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