જો ${\log _4}5 = a$ અને ${\log _5}6 = b$ હોય,તો ${\log _3}2$ ની કિંમત શોધો.

  • A
    $\frac{1}{{2a + 1}}$
  • B
    $\frac{1}{{2ab + 1}}$
  • C
    $\frac{1}{{2ab - 1}}$
  • D
    $\frac{1}{ab}$

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ધારો કે $k>0$ અને $t=\operatorname{sech}^{-1}\left(\frac{1}{2}\right)-\operatorname{cosech}^{-1}\left(\frac{3}{k}\right)$. જો $3 e^t=2+\sqrt{3}$ હોય,તો $k=$

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