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If cos h (x)=(5)/(4), then cos h (3x)=...

If `cos h (x)=(5)/(4)`, then `cos h (3x)=`

A

`(61)/(16)`

B

`(63)/(16)`

C

`(65)/(16)`

D

`(61)/(63)`

Text Solution

Verified by Experts

The correct Answer is:
C
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