$\left(4xy-3x^2y^2+2xm\right)+\left(-2xy+2x^2y^2-xm\right)$
$i^2-20$
$5x-\:4y\:-3y$
$6xy+3xy+xy-xy^2$
$\frac{dx}{dv}=\sin\left(3v\right)\cos\left(3v\right)$
$\frac{8x^3+y^3}{2x+y}$
$81y^2-90y+25$
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