A:slow
B:around
C:yellow
2×4____9
4×4____17
5×4____21
10×4____40
Lin is going to __________ from Dalian to Beijing when Lin's older.
将函数y=sinx的图像上所有的点向右平行移动π10个单位长度,再把所得各点的横坐标伸长到原来的2倍(纵坐标不变),所得图像的函数解析式是( )