求极限；（3）lim _(xarrow 0)dfrac (sin 2x)(sin 5x)；

(3) lim _(xarrow 0)dfrac (sin 2x)(sin 5x);

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

1.求下列极限:-|||-(1) lim _(xarrow 0)dfrac (sin 2x)(x);-|||-(3) lim _(xarrow dfrac {p

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

0°.求下列极限.-|||-(4) lim _(xarrow 0)(dfrac (1)({sin )^2x}-dfrac ({cos )^2x}({x)^2})

求极限 lim _(xarrow 0)dfrac (ln (1+{x)^2)-ln (1+(sin )^2x)}(x{sin )^3x}

1.计算下列极限:-|||-(1) lim _(xarrow 0)dfrac (sin 3x)(sin 5x)

求极限：lim _(xarrow 0)dfrac (1-{x)^2-(e)^-(x^2)}(x{sin )^3(2x)} 求极限：

求lim _(xarrow 0)(dfrac (1)({sin )^2x}-dfrac (1)({x)^2}).求.

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