Q.21 The value of 0 satisfying 3cos20-213 sin cos 0 - 3 sin? 0 = 0 are- (C) 2017 , n (D) 2n1 + , nn

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( 3 cos ^{2} theta-3 / 3 sin theta cos theta+int 3 sin theta cos theta-3 sin ^{2} theta )

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