1.

If cos theta + cos 2theta + cos 3theta = 0 then theta =

Answer»

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

Answer :A


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