{x in IR : cos 2x + 2 cos^(2) x - 2 = 0}...

`{x in IR : cos 2x + 2 cos^(2) x - 2 = 0}=`

A

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

B

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

C

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

D

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

Verified by Experts

The correct Answer is:

B

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