[题目]设 (x)=((dfrac {1)(x))}^x+(x)^2x, 求f(x).

[题目]若 (x+dfrac (1)(x))=dfrac (x+{x)^3}(1+{x)^4} 求f(x).

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

求极限lim _(xarrow 0)((x+{e)^x)}^dfrac (1{2x)}求极限

[题目]求 lim _(xarrow 0)(dfrac (1)({sin )^2x}-dfrac ({cos )^2x}({x)^2})

[题目]求 lim _(xarrow 0)(dfrac (1)({sin )^2x}-dfrac ({cos )^2x}({x)^2})

设(x)+(x)^2f(dfrac (1)(x))=dfrac ({x)^2+2x}(x+1) 求f(x)设

[题目]设 (dfrac (1)(x))=dfrac (x)({x)^2+1} 则 f(x)=

[题目]设 (x+dfrac (1)(x))=(x)^2+dfrac (1)({x)^2}, 则f(x)= __

已知 (x+dfrac (1)(x))=dfrac (x+{x)^3}(1+{x)^4} ,求 f(x)

1.设 (x)=dfrac (1)(1-{x)^2}, 求 (-x),f[ f(x)] ,f[ dfrac (1)(f(x))]