यदि $\int e^x \left( \frac{1 - \sin x}{1 - \cos x} \right) dx = f(x) + \text{constant}$ है,तो $f(x)$ का मान ज्ञात कीजिए।

  • A
    $e^x \cot \left( \frac{x}{2} \right)$
  • B
    $e^{-x} \cot \left( \frac{x}{2} \right)$
  • C
    $-e^x \cot \left( \frac{x}{2} \right)$
  • D
    $-e^{-x} \cot \left( \frac{x}{2} \right)$

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