1.求极限lim_(xto0)([x-ln(x+sqrt(1+x^2))]sin x^2)/([x-ln(1+x)](arctan x-x)).1.求极限$\l
求极限underset(lim)(x→0)cotx（(1)/(sinx)-(1)/(x)）求极限$\underset{lim}{x→0}$cotx（$\frac
求极限, lim_(x arrow 0)(ln(1+x))/(x)求极限, $\lim_{x \rightarrow 0}\frac{\ln(1+x)}{x}$
注 类似地，求极限lim_(xto0)(ln(1+x)ln(1-x)-ln(1-x^2))/(x^4).注 类似地，求极限$\lim_{x\to0}\frac{
注 类似地，求极限lim_(xto0)(ln(1+x)ln(1-x)-ln(1-x^2))/(x^4).注 类似地，求极限$\lim_{x\to0}\frac{
求极限 lim _(x arrow 0) (x- ln (1+x))/(1- cos x)17. 求极限 $\lim _{x \rightarrow 0} \f
注 underdot(类)似地，求极限lim_(xto0)(ln(1+x)ln(1-x)-ln(1-x^2))/(x^4).注 $\underdot{类}$似地
求极限 lim _(xarrow 0)[ dfrac (1)(x)-dfrac (1)({x)^2}ln (1+x)] .
求极限underset(lim)(x→0)（((a)^x+(b)^x+(c)^x)/(3)）{}^(1)/(x)（a＞0，b＞0，c＞0）求极限$\unders
underset(lim)(x→0)dfrac(1-sqrt(1-{x)^2)}({e)^x-cosx}= _____．= _____．