5.求极限 lim _(xarrow 0)dfrac ({tan )^2x-(x)^2}({x)^2(tan )^2x}

21.计算极限 lim _(xarrow {0)^+}dfrac (ln tan 5x)(ln tan 2x)

利用等价无穷小的性质，求下列极限：（1）lim _(xarrow 0)dfrac (tan 3x)(2x)（2）lim _(xarrow 0)dfrac (ta

.求极限 lim _(xarrow 0)dfrac (x-tan x)(xln (1+{x)^2)}

求极限 lim _(xarrow 1)(1-(x)^2)tan dfrac (pi )(2)x

[题目]求极限 lim _(xarrow 0)dfrac (tan x-x)({x)^2((e)^x-1)}

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

2.求下列极限:-|||-(1) lim _(xarrow 4)dfrac ({x)^4-256}(x-4);-|||-(2) lim _(xarrow 0)d

lim _(xarrow 0)dfrac ({(1+2{x)^2)}^dfrac (3{2)}-1}(tan 2x(cos sqrt {x)-1)}。。

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

求极限lim _(xarrow {0)^+}((dfrac {1)(x))}^tan x=求极限