જો $\cos \alpha = \operatorname{sech} \beta$ હોય,તો $\beta =$

  • A
    $\log (\sec \alpha + \tan \alpha)$
  • B
    $\log (\sec \alpha - \tan \alpha)$
  • C
    $\log (\sin \alpha + \cos \alpha)$
  • D
    $\log (\cos \alpha + \cot \alpha)$

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જો $a \cos 2\theta + b \sin 2\theta = c$ ના ઉકેલ $\alpha$ અને $\beta$ હોય,તો $\tan \alpha + \tan \beta$ ની કિંમત શોધો.

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