跟刚才那题一样的啊
x→0时,1-cosx等价于x^2/2
lim(x→0)(1-cosx)^2/x^3
=lim(x→0)(x^4/4)/x^3
=lim(x→0)x/4=0
所以(1-cosx)^2是x^3的高阶无穷小
验证当x→0时(1-cosx)^2是x^3的高阶无穷小
验证当x→0时(1-cosx)^2是x^3的高阶无穷小
数学人气:271 ℃时间:2020-03-24 08:43:13
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