The set S(1) and S(2) are solution sets ...

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

A

`{n pi , n in A} and (1)/( 2) {n pi + (-1)^(n) sin ^(-1) (a sin b) + b, n in Z}`

B

`{n(pi)/(2), n in Z} and { n pi + (- 1)^(n)sin ^(-1) ( a sin b) , n in Z}`

C

`{n (pi)/( 2), n in Z} and {n pi + ( - 1)^(n) sin^(-1) ((a)/( 2) sin b) , n in Z}`

D

None of these

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The correct Answer is:

A

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