> 数学 >
x趋向0 lim(cot x- 1/x)=?
人气:426 ℃ 时间:2020-04-26 07:09:29
解答
x→0时cotx-1/x
=cosx/sinx-1/x
→(cosx-1)/x
=-2[sin(x/2)]/x
→-2(x/2)^2/x
=-x/2→0.
推荐
猜你喜欢
© 2024 79432.Com All Rights Reserved.
电脑版|手机版