$\int\:\frac{2}{x^2+3x+1}dx$

$5\:\frac{dy}{dx}+\:4xy=10$

$8x-15\ge81$

$\int y^3\sin\left(xy\right)dy$

$2x\:+\:x\:+\:4\:+\:3$

$2\left(2\right)^{4}\left(-7\right)+\left(2\right)\left(-1\right)^{3}-8\left(2\right)^{2}\left(-1\right)^{2}$

$\lim_{x\to2}\left(\frac{x^2+x-2}{x^2-4}\right)$