1.

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

Answer»

`{2 n PI pm (pi)/(3): n in Z}`
`{2 n pi pm (pi)/(6): n in Z}`
`{2 n pi pm (pi)/(2): n in Z}`
`{2 n pi pm (pi)/(4): n in Z}`

Answer :D


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