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cos[2(tan^(-1).(1)/(5)+tan^(-1)5)] = ....

`cos[2(tan^(-1).(1)/(5)+tan^(-1)5)]` = ________.

A

`(1)/(sqrt(2))`

B

0

C

1

D

`-1`

Text Solution

Verified by Experts

The correct Answer is:
D
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