有下列四種變換方式:
①向左平移
,再將橫坐標變?yōu)樵瓉淼?img src="http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823144228747225.gif" style="vertical-align:middle;" />(縱坐標不變);
②橫坐標變?yōu)樵瓉淼?img src="http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823144228747225.gif" style="vertical-align:middle;" />(縱坐標不變),再向左平移
;
③橫坐標變?yōu)樵瓉淼?img src="http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823144228747225.gif" style="vertical-align:middle;" />(縱坐標不變),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/20140823/20140823144228747225.gif" style="vertical-align:middle;" />(縱坐標不變);
其中能將正弦曲線
的圖像變?yōu)?img src="http://thumb.1010pic.com/pic2/upload/papers/20140823/20140823144228965591.gif" style="vertical-align:middle;" />的圖像的是