有以下四種變換方式:
①向左平移
,再將橫坐標變?yōu)樵瓉淼?img src="http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823175553373225.gif" style="vertical-align:middle;" />;②將橫坐標變?yōu)樵瓉淼?img src="http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823175553373225.gif" style="vertical-align:middle;" />,再向左平移
;
③將橫坐標變?yōu)樵瓉淼?img src="http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823175553373225.gif" style="vertical-align:middle;" />,再向左平移
;④向左平移
,再將橫坐標變?yōu)樵瓉淼?img src="http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823175553373225.gif" style="vertical-align:middle;" />。
其中,能將正弦函數(shù)y=sinx的圖象變?yōu)閥=sin(2x+
)的圖象的是( )