$ax-2by-2ay+4by$
$\:\int3x\:\csc^2\left(2x\right)dx$
$\lim_{x\to0}\left(\frac{3x^2}{2\:ln\left(sec\:x\right)\:}\right)$
$\frac{d}{dx}2x^2+y^5=8$
$x^2+18x+85$
$2y^2+7x^2-13=0$
$\left(3-a\right)\left(x-1\right)$
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