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【单选题】
要得到函数y=cos2x的图象,只需把函数y=sinx的图象(  )
A.
沿x轴向左平移 π 2 个单位,再把横坐标伸长为原来的2倍,纵坐标不变
B.
沿x轴向右平移 π 2 个单位,再把横坐标伸长为原来的2倍,纵坐标不变
C.
横坐标缩短为原来的 1 2 ,纵坐标不变再沿x轴向右平移 π 4 个单位
D.
横坐标缩短为原来的 1 2 ,纵坐标不变,再沿x轴向左平移 π 4 个单位
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