$\left(xy\right)dy\:=\:-\left(1+y^2\right)dx$
$\left(-3x+3x^2\right)+\left(-3x^2\right)$
$\left(6x+4y\right)\left(4x+2y\right)$
$0^3-0^2+3x-1$
$13\left(\cos^2x\right)+14\left(\sin^2x\right)=13\sin^2x$
$\lim_{x\to0}\left(\frac{ln\left(x\right)}{4x-4}\right)$
$45+66+719$
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