Math Chapter Wise Sets, Relations And Functions English MCQ KVS PGT 23-12-2018 Q.If f(x) cosx sinx = − = − then f ' 3 π is equal to: A3 1 2 + − B3 1 2 − + C−3 1/2 D3 1 2 + Show answer Correct answer: 3 1 2 +