જો $\cosh x = \frac{5}{4}$ હોય,તો $\tanh 3x =$ શું થાય?

  • A
    $\frac{63}{65}$
  • B
    $\frac{25}{26}$
  • C
    $\frac{65}{67}$
  • D
    $\frac{252}{265}$

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જો $A$ એ $\frac{\pi}{2}$ નો પૂર્ણાંક ગુણક ન હોય,તો $\operatorname{cosec} 2A + \cot 2A$ બરાબર શું થાય?

$\sin 20^\circ \sin 40^\circ \sin 60^\circ \sin 80^\circ = $

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