1.

The set S_(1) and S_(2) are solution sets of (1+a)cos theta cos (2 thetacos (2 theta-b)=(1+a cos 2 theta)cos (theta-b)

Answer»

`{n PI , n in Z}` and `1/2 {n pi +(-1)^(n)SIN^(-1)(a sin b)=b , n in Z}`
`{n (pi)/2, n in Z}` and `{ n pi+(-1)^(n)sin^(-1)(a sin b ), n in Z}`
`{n (pi)/2, nin Z}` and `{n pi +(-1)^(n)sin^(-1)(a/2 sin b), nin Z}`
None of these

Answer :A


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