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The value of cos[2tan^(-1)(-7)] is :a)49...

The value of `cos[2tan^(-1)(-7)]` is :a)`49/50` b)`-49/50` c)`24/25` d)`-24/25`

A

`49/50`

B

`-49/50`

C

`24/25`

D

`-24/25`

Text Solution

Verified by Experts

The correct Answer is:
D
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