$\tan 1^{\circ}, \tan 2^{\circ}, \ldots, \tan 89^{\circ}$ નો ગુણોત્તર મધ્યક (geometric mean) શોધો.

  • A
    $\frac{1}{89}$
  • B
    $1$
  • C
    $\frac{1}{3}$
  • D
    $\sqrt{3}$

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જો $\operatorname{Sinh}^{-1} x = \log 3$ અને $\operatorname{Cosh}^{-1} y = \log \frac{3}{2}$ હોય,તો $\operatorname{Tanh}^{-1}(x-y) = $

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