求详细解答过程~
2个回答
2016-10-18
展开全部
(x→0)lim {(1-cosx)/x²}
= (x→0)lim {2sin²(x/2)/x²}
= (x→0)lim (1/2){sin²(x/2)/(x/2)²}
= (1/2) * { (x/2→0)lim(sin(x/2)/(x/2) }²
= 1/2×1²
= 1/2
= (x→0)lim {2sin²(x/2)/x²}
= (x→0)lim (1/2){sin²(x/2)/(x/2)²}
= (1/2) * { (x/2→0)lim(sin(x/2)/(x/2) }²
= 1/2×1²
= 1/2
更多追问追答
追问
答案是二分之一。。。。。。
追答
是的,是1/2
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询