1.

Let `S_(1)` be the set of all those solution of the equation `(1+a) cos theta cos(2 theta-b)=(1+a cos 2 theta) cos (theta -b)` which are independent of a and b and `S_(2)` be the set of all such solutions which are dependent on a and b. Then Condition that should be imposed on a and b such that `S_(2)` in non empty isA. `|a/2 sin b| lt 1`B. `|a/2 sin b| le 1`C. `|a sin b| le 1`D. none of these

Answer» Correct Answer - C
`sin (2 theta-b)=a sin b rArr |a sin b| le 1`


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