有下列四種變換方式:
①向左平移,再將橫坐標(biāo)變?yōu)樵瓉淼?img src="http://thumb.1010pic.com/pic6/res/gzsx/web/STSource/20131101230301966748008/SYS201311012303019667480001_ST/1.png">;   
②橫坐標(biāo)變?yōu)樵瓉淼?img src="http://thumb.1010pic.com/pic6/res/gzsx/web/STSource/20131101230301966748008/SYS201311012303019667480001_ST/2.png">,再向左平移
③橫坐標(biāo)變?yōu)樵瓉淼?img src="http://thumb.1010pic.com/pic6/res/gzsx/web/STSource/20131101230301966748008/SYS201311012303019667480001_ST/4.png">,再向左平移;     
④向左平移,再將橫坐標(biāo)變?yōu)樵瓉淼?img src="http://thumb.1010pic.com/pic6/res/gzsx/web/STSource/20131101230301966748008/SYS201311012303019667480001_ST/7.png">;
其中能將正弦曲線y=sinx的圖象變?yōu)?img src="http://thumb.1010pic.com/pic6/res/gzsx/web/STSource/20131101230301966748008/SYS201311012303019667480001_ST/8.png">的圖象的是( )
A.①和②
B.①和③
C.②和③
D.②和④
【答案】分析:直接利用函數(shù)的圖象的平移變換,由正弦曲線y=sinx的圖象變?yōu)?img src="http://thumb.1010pic.com/pic6/res/gzsx/web/STSource/20131101230301966748008/SYS201311012303019667480001_DA/0.png">的圖象,即可得到選項(xiàng).
解答:解:正弦曲線y=sinx的圖象向左平移,得到函數(shù)的圖象,再將橫坐標(biāo)變?yōu)樵瓉淼?img src="http://thumb.1010pic.com/pic6/res/gzsx/web/STSource/20131101230301966748008/SYS201311012303019667480001_DA/3.png">,變?yōu)?img src="http://thumb.1010pic.com/pic6/res/gzsx/web/STSource/20131101230301966748008/SYS201311012303019667480001_DA/4.png">的圖象;
將正弦曲線y=sinx的圖象橫坐標(biāo)變?yōu)樵瓉淼?img src="http://thumb.1010pic.com/pic6/res/gzsx/web/STSource/20131101230301966748008/SYS201311012303019667480001_DA/5.png">,得到函數(shù)y=sin2x的圖象,再向左平移,變?yōu)?img src="http://thumb.1010pic.com/pic6/res/gzsx/web/STSource/20131101230301966748008/SYS201311012303019667480001_DA/7.png">的圖象;
故選A.
點(diǎn)評(píng):本題主要考查三角函數(shù)的平移.三角函數(shù)的平移原則為左加右減上加下減.注意兩種變換的方式的區(qū)別.
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