$\operatorname{sech}^{-1}(\sin \theta)$ કોના બરાબર છે?

  • A
    $\log \tan \frac{\theta}{2}$
  • B
    $\log \sin \frac{\theta}{2}$
  • C
    $\log \cos \frac{\theta}{2}$
  • D
    $\log \cot \frac{\theta}{2}$

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