函数的图象X)sin(xAy)3sin(xy)4sin(xyy=sinx的影响1.在同一坐标系中分别作出下列函数在一个周期内的图象.●●●●●●●●●●y10-1x223234963243454354767y=sinx)3sin(xy)4sin(xy的影响xysin)sin(xy向左平移个单位长度xxxysin)sin(xy向右平移个单位长度xxxysin)6sin(xy向左平移个单位长度66xx)3sin(xy6xx)6sin(xy向左平移个单位长度61.2.]6)6sin[(xy即)(xfy)(xfy向左平移个单位长度xx)(xfy)(xfy向右平移个单位长度xxxycos)4cos(xy向右平移个单位长度44xx作出y=sinx,y=sin2x,在一个周期内的图象xy21sin的影响2.z=2x0x0y=sin2x010-1022234243z=x0x0y=sinx010-1021222323421的影响作出y=sinx,y=sin2x,在一个周期内的图象xy21sin●●●●●●●●●●y10-1x234y=sinxy=sin2x的影响xysinxysin横坐标变为原来的倍1xxxy21sinxysinxysin横坐标变为原来的倍1xx)(xfy)(xfy横坐标变为原来的倍1xxxy51cosxycos横坐标变为原来的倍5xx51)32sin(xy)3sin(xy横坐标变为原来的倍21xx2)32sin(3xy)3sin(3xy横坐标变为原来的倍21xx2A的影响y=sinxy=2sinx在同一坐标系中分别作出下列函数在一个周期内的图象.xysin313.x0y=sinx010-10y=2sinx020-20y=sinx0002221212123●●●●●●●●●●y210-1-2x2232y=sinxy=2sinxA的影响xysinxAysin纵坐标变为原来的倍Axysin21xysinxAysin纵坐标变为原来的倍A)(xfy)(xAfy纵坐标变为原来的倍Axysin向左平移个单位长度4横坐标变为原来的倍21xysin向左平移个单位长度4横坐标变为原来的倍21)4sin(xy)42sin(xyxy2sin)22sin(xyxy2cos即的图象)32sin(3xyxysin)3sin(xy)32sin(xy)32sin(3xyxysinxy2sin)32sin(xy)32sin(3xy向左平移个单位长度3横坐标变为原来的倍21纵坐标变为原来的3倍横坐标变为原来的倍21向左平移个单位长度6纵坐标变为原来的3倍练习1.函数的图象可由函数sin2yx的图象经过下列哪种变换得到()A.向右平移个单位长度3B.向左平移个单位长度3C.向右平移个单位长度6D.向左平移个单位长度6)32sin(xyC2.把函数的图象向左平移1个单位长度得到的是函数的图象.xycos21cos2xy•振幅:•周期:•频率:•相位:•初相:A2T21Tfx)sin(xAy