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If ("3 sinh "2 theta)/("5 + 4 cosh "2 ...

If ` ("3 sinh "2 theta)/("5 + 4 cosh "2 theta) = 1`, then tanh`""^2 theta + 6` tanh `theta` is equal to

A

`3`

B

`4`

C

`5`

D

`9`

Text Solution

Verified by Experts

The correct Answer is:
D
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