$3xy^2-2xy+y,\:x=-2,\:y=2$

$2\left(\frac{2}{x}\right)\left(\frac{3}{y}\right)$

$\frac{1}{2}x-4^2$

$\frac{2x^2+13x+16}{x+5}$

$\frac{1}{1+\tan^2y}+\frac{1}{1+\cot^2y}=1$

$\frac{dy}{dx}=e^{e+2y}$

$\lim_{x\to3}\left(\frac{\left(x^3-27\right)\left(2x+1\right)}{x-3}\right)$