1.

The solution of the equation 9cos^(12)x+cos^(2)2x+1=6cos^(6)xcos3x+6cos^(6)x-2cos2x is /are

Answer»

`X=npi+(PI)/2, N in I`
`x -n pi +cos^(-1)(root(4)(2/3)), n in I`
`x=n pi -cos^(-1)(root(4)(2/3)), n in I`
`x=npi-(pi)/2, n in I`

Answer :A::B::C


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