求lim x-0 sinx-x/x^2sinx的极限
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求limx-0sinx-x/x^2sinx的极限求limx-0sinx-x/x^2sinx的极限求limx-0sinx-x/x^2sinx的极限lim{x→0}(sinx-x)/(x²sin
求lim x-0 sinx-x/x^2sinx的极限
求lim x-0 sinx-x/x^2sinx的极限
求lim x-0 sinx-x/x^2sinx的极限
lim {x→0} (sinx - x) / (x²sinx)
方法1:罗必塔
= lim {x→0} (cosx - 1) / (2xsinx + x²cosx) 上下求导
= lim {x→0} ( - sinx) / (2sinx + 2xcosx +2xcosx - x²sinx) 继续上下求导
= lim {x→0} ( - sinx) / (2sinx + 4xcosx - x²sinx) 上下同除sinx
= lim {x→0} ( - 1) / (2 + 4xcosx/sinx - x²) 利用sinx / x → 1
= - 1 / 6
方法2:等价无穷小替换 sinx = x - x³/6 + o(x³) -------就是取麦克劳林展开
lim {x→0} (sinx - x) / (x²sinx)
= lim {x→0} ( - x³/6) / (x²*x) = - 1 / 6
sinx-x/x^2sinx
洛必达上下同时求导(用三次)
=cosx-1/(2xsinx+x^2cosx)
=-sinx/(2sinx+2xcosx+2xcosx-x^2sinx)
=-cosx/(2cosx+4cosx-4xsinx-2xsinx-x^2cosx)
limx-0=-1/(2+4)=-1/6
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