x—＞∞,f(x)=x*sin(360/x)
问题描述：
x—＞∞,f(x)=x*sin(360/x)
答
f(x)=360*sin(360/x)/(360/x)
令a=360/x
x—＞∞则a—＞0
所以极限=360sina/a=360×1=360