题目

若函数y=sin(2x+θ)的图象向左平移个单位后恰好与y=sin2x的图象重合,则θ的最小正值是(    )A.               B.                  C.                D. 答案：解析:y=sin(2x+θ)y=sin［2(x+)+θ］=sin(2x++θ).∵y=sin2x与y=sin(2x++θ)重合,∴+θ=2kπ.∴θ=2kπ-.∴k=1,θ=2π-=.答案:D用所给动词的正确形式填空。 Tom ____________ (not do) his homework. So he can't go to play football with us.