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If tanh^2 x = sec theta, then cosh 2x =...

If `tanh^2 x = sec theta`, then cosh 2x =

A

`tan^2 (theta//2)`

B

`cot^2 (theta//2)`

C

`sec^2 (theta//2)`

D

none

Text Solution

Verified by Experts

The correct Answer is:
B
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