$x^2-4y+2y$

$\left(2x\left(y+3\right)\right)\:\left(y\left(2x-1\right)\right)$

$15\left(2\right)-4$

$\frac{dy}{dt}=\frac{\left(4t+ty^2\right)}{\left(9+t^2\right)}$

$\int\left(\frac{x}{\sqrt{2x^2-7}}\right)dx$

$\frac{20\:x^{15}}{4\:x^7}$

$\lim_{x\to0^{-x}}\left(\sqrt{3x+\frac{9}{x^2}}\right)$