已知=(x)^2x+((2x))^x(x>0)，求=(x)^2x+((2x))^x.

lim _(xarrow 0)dfrac (ln ({sin )^2x+(e)^x)-x}(ln ({x)^2+(e)^2x)-2x}

[题目] (sin )^2x+(cos )^2x= __

6.求下列极限:-|||-lim _(xarrow 0)dfrac (ln ({sin )^2x+(e)^x)-x}(ln ({e)^2x-(x)^2)-2x}

设=sin 2x+(ln )^3x，求=sin 2x+(ln )^3x设，求

设=sin 2x+(ln )^3x，求=sin 2x+(ln )^3x设，求

设 g(x)={2−x,x⩽0x+2,x>0 ， f(x)={x2,x<0−x,x⩾0 ，则

设((sin )^2x)=dfrac (x)(sin x)，求((sin )^2x)=dfrac (x)(sin x) .设，求.

设=ln (x)^2+ln 2x，则=ln (x)^2+ln 2x（ ）=ln (x)^2+ln 2x=ln (x)^2+ln 2x=ln (x)

已知f（2x）=x2-2x，则f（x）=（ ）A. $\frac{1}{4}x^{2}+1$B. $\frac{1}{4}x^{2}-1$C. $\frac{1

求极限lim _(xarrow 0)(dfrac (1)({sin )^2x}-dfrac ({cos )^2x}({x)^2})= ()求极限