cos 2x=(sqrt(2)+1)(cos x - (1)/(sqrt(2))...

`cos 2x=(sqrt(2)+1)(cos x - (1)/(sqrt(2))), cos x ne (1)/(2) rArr x in`

A

`{2 n pi pm (pi)/(3): n in Z}`

B

`{2 n pi pm (pi)/(6): n in Z}`

C

`{2 n pi pm (pi)/(2): n in Z}`

D

`{2 n pi pm (pi)/(4): n in Z}`

Verified by Experts

The correct Answer is:

D

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