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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

`{2npi +-(pi)/3, n in Z}`

B

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

C

`{ 2n pi +-(pi)/2, n inZ}`

D

`{2n pi +-(pi)/4, n in Z}`

Text Solution

Verified by Experts

The correct Answer is:
D
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