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If cosh (alpha-beta)=a cosh(alpha+beta) ...

If `cosh (alpha-beta)=a cosh(alpha+beta)` then `cot h alpha cot h beta=`

A

`(a+1)/(a-1)`

B

`(1+a)/(1-a)`

C

`(a-1)/(a+b)`

D

`(1-a)/(1+a)`

Text Solution

Verified by Experts

The correct Answer is:
B
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