$3e^xtany+y'\left(2-e^x\right)sec^2y=0$
$x^4-x^2-2$
$\frac{dy}{dx}=\left(1+6x\right)y\left(1-y\right)$
$( x + 1 ) ( x - 6 )$
$\lim_{x\to3}\left(\left(5x^{2}-9x+7\right)\right)$
$\left(+5\right)\left(-7\right)+\left(-3\right)$
$\left(xy^2+2z\right)\left(xy^2-3q\right)$
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