यदि $\theta = \sec^{-1}(\cosh u)$ है,तो $u =$

  • A
    $\log_e\left(\cot \left(\frac{\theta}{2} - \frac{\pi}{4}\right)\right)$
  • B
    $\log_e\left(\tan \left(\frac{\theta}{2} - \frac{\pi}{4}\right)\right)$
  • C
    $\log_e\left(\tan \left(\frac{\pi}{4} - \frac{\theta}{2}\right)\right)$
  • D
    $\log_e\left(\tan \left(\frac{\pi}{4} + \frac{\theta}{2}\right)\right)$

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