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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