$\operatorname{cosec}\left[2 \cot ^{-1}(5)+\cos ^{-1}\left(\frac{4}{5}\right)\right]$ ની કિંમત ..... છે.

  • A
    $\frac{56}{33}$
  • B
    $\frac{65}{56}$
  • C
    $\frac{65}{33}$
  • D
    $\frac{75}{56}$

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કિંમત શોધો: ${\cot ^{ - 1}}3 + {\csc ^{ - 1}}\sqrt 5 = $

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$\cot^{-1} \left[ \frac{\sqrt{1 - \sin x} + \sqrt{1 + \sin x}}{\sqrt{1 - \sin x} - \sqrt{1 + \sin x}} \right]$ ની કિંમત શોધો, જ્યાં $x \in (0, \frac{\pi}{2})$ છે.

જો $\tan^{-1}(1) + \tan^{-1}(3) + \tan^{-1}(5) + \tan^{-1}(1/4) = \pi + \tan^{-1}(\alpha/2)$ હોય, તો $\alpha$ ની કિંમત છે... ($/41$ માં)

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