Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesTrigonometrical ratios of multiple and sub-multiple angles
MediumIf $\cosh(x) = \frac{5}{4}$,then $\cosh(3x)$ is equal to
- A$\frac{61}{16}$
- B$\frac{63}{16}$
- C$\frac{65}{16}$
- D$\frac{61}{63}$
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