જો $\cosh(x) = \frac{5}{4}$ હોય,તો $\cosh(3x)$ ની કિંમત કેટલી થાય?

  • A
    $\frac{61}{16}$
  • B
    $\frac{63}{16}$
  • C
    $\frac{65}{16}$
  • D
    $\frac{61}{63}$

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જો $x \in \left(0, \frac{\pi}{2}\right)$ અને $x$ એ સમીકરણ $\sin x \cos x = \frac{1}{4}$ નું સમાધાન કરતું હોય,તો $x$ ની કિંમતો શોધો.

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જો $\frac{\cos ^2 48^{\circ}-\sin ^2 12^{\circ}}{\sin ^2 24^{\circ}-\sin ^2 6^{\circ}}=\frac{\alpha+\beta \sqrt{5}}{2}$, જ્યાં $\alpha, \beta \in N$, તો $\alpha+\beta$ ની કિંમત . . . . . . થાય.

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