试题与答案

函数y=f(x)的横坐标伸长到原来的2倍,再向左平移π2个单位长度,所得到的曲线

题型:解答题

题目:

函数y=f(x)的横坐标伸长到原来的2倍,再向左平移
π
2
个单位长度,所得到的曲线是y=
1
3
sinx的图象,求函数y=f(x)的解析式.

答案:

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