यदि $\int \cos x \log \left(\tan \frac{x}{2}\right) dx = \sin x \log \left(\tan \frac{x}{2}\right) + f(x)$ है,तो $f(x)$ किसके बराबर है? (मान लीजिए कि $c$ एक स्वेच्छ वास्तविक स्थिरांक है।)

  • A
    $c$
  • B
    $c-x$
  • C
    $c+x$
  • D
    $2x+c$

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