(x)=(e)^2xtan x(x)=(e)^2xtan x(x)=(e)^2xtan x(x)=(e)^2xtan x

判断题：tan x)=(sec )^2xtan x)=(sec )^2x 正确 tan x)=(sec )^2x 错误判断题：正确错误

已知 =sqrt (xsqrt {x)}+xtan x-(e)^2, 求y`.

sec^2xtan ydx+sec^2ytan xdy=0$sec^{2}x\tan ydx+sec^{2}y\tan xdy=0$

lim _(xarrow 0)(dfrac (1)(xtan x)-dfrac (1)({x)^2});

lim _(xarrow 0)dfrac (xtan x)(sqrt {1-{x)^2}-1}=________.________.

(8) lim _(xarrow 0)dfrac (xtan x)(sqrt {1-{x)^2}-1}

[题目]-|||-lim _(xarrow 0)dfrac (xtan x)(sqrt {1-{x)^2}-1}

微分方程 (e)^xtan ydx+(1-(e)^x)(sec )^2ydy=0 的通解是 __

设=(x)^2(e)^x,则=(x)^2(e)^x=（ ）。A =(x)^2(e)^xB =(x)^2(e)^xC =(x)^2(e)^xD

计算极限__-|||-lim _(xarrow 0)dfrac ({(1+{x)^2)}^dfrac (1{3)}-1}(xtan x)=计算极限