早教吧 育儿知识 作业答案 考试题库 百科 知识分享

lim(x→0)(sec-1)/(x^2/2)的极限怎么求?

题目详情
lim(x→0)(sec-1)/(x^2/2)的极限怎么求?
▼优质解答
答案和解析
lim(x→0)(secx-1)/(x^2/2) (0/0)
=lim(x→0) (secxtanx)/ x (0/0)
=lim(x→0) [(secx)^3- secx(tanx)^2]
=1