lim x→∞ XSIN 1/X= 应选a.0 b.1 c.2 d.∞
问题描述:
lim x→∞ XSIN 1/X= 应选a.0 b.1 c.2 d.∞
答
令y=1/x
则原式=lim y->0 (siny)/y=1
选b