1.

If cos x cos 2x cos 3x=1//4, then x=

Answer»

`(2n+1)(PI)/8, n pi +-(pi)/3, n in Z`
`(2n+1)(pi)/4, n pi +-(pi)/6, n in Z`
`(2n+1)(pi)/3, n pi +-(pi)/6 , n in Z`
`(2n+1)(pi)/6, n pi +-(pi)/3, n in Z`

ANSWER :A


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