1.

If cos2x=(sqrt2+1)(cosx-1/sqrt2), cos x ne 1/2,then xbelong to

Answer»

`{2npi pm PI/3: n in I}`
`{2npi pm pi/6: n in I}`
`{2npi pm pi/2 : n in I}`
`{2N pi pm pi/4 : n in I}`

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