> 数学 >
求lim(1-cosx)/x^2
求lim(1-COSX)/X^2
X→0
人气:283 ℃ 时间:2020-06-21 07:27:21
解答
答:
lim(x→0) (1-cosx)/x²
=lim(x→0) 2sin²(x/2)/[4*(x/2)²]
=lim(t→0) (1/2)(sint/t)²
=1/2
推荐
猜你喜欢
© 2026 79432.Com All Rights Reserved.
电脑版|手机版