જો $u = \log \tan \left(\frac{\pi}{4} + \frac{\theta}{2}\right)$ હોય,તો $\cosh u =$

  • A
    $\sec \theta$
  • B
    $\tan \theta$
  • C
    $\operatorname{cosec} \theta$
  • D
    $\cot \theta$

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