[题目]已知f(x)在 x=0 的某个邻域内连续,且-|||-(0)=0, lim _(xarrow 0)dfrac (f(x))(1-cos x)=2, 则在点 x=0 处f(x)()-|||-A.不可导-|||-B.可导,且 (0)neq 0-|||-C.取得极大值-|||-D.取得极小值

已知f(x)在 x=0 的某个邻域内连续,且 lim _(xarrow 0)dfrac (f(x))(1-cos x)=2, 则在点 x=0 处f(x )f(x

已知f(x)在x=0的某个邻域内连续，且f(0)=0.underset(lim)(x→0)(f(x))/(1-cosx)=2．则在点x=0处f(x)( )A.

设 f(x) 在 x=0 的某邻域内连续，且lim_(x to 0) (f(x))/(x(1-cos x)) = -1，则 x=0 ( )A. 是 $f(x)$

已知函数f(x,y)在点(0,0)的某个邻域内连续，且lim_(x to 0 cdot y to 0) (f(x,y))/(1-cos(x^2)+y^(2))=

已知函数f(x)在 x=0 的某个邻域内有连续导数,且 lim _(xarrow 0)(dfrac (sin x)({x)^2}+dfrac (f(x))(x)

[题目]设f(x)在 x=0 处连续,且 lim _(xarrow 0)dfrac ((f(x)+1){x)^2}(x-sin x)=2,-|||-则曲线 =f

[题目]已知f(x)在 x=0 处可导,且 (0)=0, 则-|||-lim _(xarrow 0)dfrac ({x)^2f(x)-2f((x)^3)}({x

4.设f(x),g(x)在x=0的某个邻域内连续,且lim_(xto0)(g(x))/(x)=-1,lim_(xto0)(f(x))/(g^2)(x)=2,则在

[题目]已知f((x)在 x=0 处可导,且 (0)=0, 则-|||-lim _(xarrow 0)dfrac ({x)^2f(x)-2f((x)^3)}({

[题目]已知函数f(x,y)在点(0,0)的某个邻域内连-|||-续,且 lim _(xarrow 0)dfrac (f(x,y)-xy)({({x)^2+(y