求lim(x→0)(x-sinx)/2x^3=?
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求lim(x→0)(x-sinx)/2x^3=?求lim(x→0)(x-sinx)/2x^3=?求lim(x→0)(x-sinx)/2x^3=?lim(x→0)(x-sinx)/2x^3=lim(x→
求lim(x→0)(x-sinx)/2x^3=?
求lim(x→0)(x-sinx)/2x^3=?
求lim(x→0)(x-sinx)/2x^3=?
lim(x→0)(x-sinx)/2x^3
=lim(x→0)(1-cosx)/(6x^2)
=lim(x→0) sinx/(12x)
=lim(x→0) cosx/12
=1/12
上下求导啊
lim(x→0)(x-sinx)/2x^3
=lim(x→0)(1-cosx)/6x^2
=lim(x→0)(sinx)/12x
=lim(x→0)(cosx)/12
=1/12
1 常规方法:罗必塔法则-----省略,楼上 钟云浩 非常完美了!
2. 快速方法:级数展开
利用sinx = x - x^3/3!+ x^5/5! - ..... = x - x³/6 + O(x^5) ------------O称为低阶无穷小
Lim(x→0) [x - sinx] / 2x³
=...
全部展开
1 常规方法:罗必塔法则-----省略,楼上 钟云浩 非常完美了!
2. 快速方法:级数展开
利用sinx = x - x^3/3!+ x^5/5! - ..... = x - x³/6 + O(x^5) ------------O称为低阶无穷小
Lim(x→0) [x - sinx] / 2x³
= Lim(x→0) [x - (x - x³/6 + O(x^5))] / 2x³
= Lim(x→0) [ x³/6 + O(x^5)] / 2x³
= [1/ 6] / 2
=1/12
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