$\left(4x-6y\right)\left(5x+3y\right)$
$\lim_{x\to2}\left(\frac{2x^2-4}{x-1}\right)$
$5a+2b=10$
$\frac{dy}{dx}=\frac{\left(2xy+2x\right)}{x^2+1}$
$\left(x^2y+xy^2\right)dy-xy^2dx=0$
$2w^4-2$
$18x^3-9x^2$
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