$3xy-5xy+xy$

$\left(12\right)^2$

$\left(y-yx^2\right)\frac{dy}{dx}=\frac{5x^2}{4y}$

$\lim_{x\to-\infty}\left(\frac{\left(2-x^3\right)}{\left(x^2+x\right)}\right)^3$

$\left(4a\sqrt{2x}\right)^3$

$\int3x^2\left(x-1\right)^2dx$

$\lim_{x\to\infty}\left(\frac{6x^4\:+2x^2+5x}{3x-3x^2+3x^4}\right)$