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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$\tan 7\frac{1}{2}^\circ$ નું મૂલ્ય કેટલું થાય?

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