lim(x趋向0)(x-arctanx)/(x-arcsinx)=?
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lim(x趋向0)(x-arctanx)/(x-arcsinx)=?
lim(x趋向0)(x-arctanx)/(x-arcsinx)=?
lim(x趋向0)(x-arctanx)/(x-arcsinx)=?
根据罗比达法则,分子分母同时求导
lim(x趋向0)(x-arctanx)/(x-arcsinx)=lim(x趋向0)[1-1/(1+x^2)]/(1-1/根号(1-x^2))
=lim(x趋向0)[x^2/(1+x^2)]/(-x^2/[(1+根号(1-x^2)(根号(1-x^2)]
=-lim(x趋向0){(1+根号(1-x^2)](根号(1-x^2)]/(1+x^2)]}=-2
-2
先用罗比达法则,分子分母求导
再繁分式化简,根式分母有理化
最后约分,求极限
先用罗比达法则,再用等价无穷小的替换.
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