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If cos hx = (5)/(2) then cos h(2x) =...

If `cos hx = (5)/(2)` then cos h(2x) =

A

`(5 sqrt(21))/(2)`

B

`(23)/(5 sqrt(21))`

C

`(23)/(2)`

D

`(7)/(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
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