要得到函数的图象可将y=sin2x的图象( ) A.向右平移个单位长度  

要得到函数的图象可将y=sin2x的图象(  )

A.向右平移个单位长度       B.向左平移个单位长度

C.向右平移个单位长度       D.向左平移个单位长度

 

答案

B【考点】函数y=Asinωx+φ)的图象变换.

【专题】阅读型.

【分析】根据函数的平移变化,,分析选项可得答案.

【解答】解:要得到函数的图象可将y=sin2x的图象向左平移

故选B

【点评】本题主要考查三角函数的平移.三角函数的平移原则为左加右减上加下减.

 

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