x→0时cos1/x的极限

来源:百度知道 编辑:UC知道 时间:2024/05/14 04:18:00

不存在。
是无限震荡的,不会趋于一个定值,故极限不存在。

doesn't exist.
proof:
consider Xn=1/(npi) n is in natural number
Xn doesn't equal to 0
lim Xn=0
and f(Xn)=cos(1/(1/npi))=cos(npi)=(-1)^n
which is not a convergent sequence.
so the limit doesn't exist.