$\lim_{x\to\infty}\left(\frac{3^x}{x+1}\right)$

$\left(-8x^3y^8z^{-2}\right)\cdot\left(9x^2y^3z\right)$

$\frac{5\:2}{5\:-3}$

$\frac{dy}{dx}\cos^2\left(x\right)-y=1$

$-20\:x-18$

$\lim_{x\to1}\left(log\left(x\right).\cot\left(1-x\right)\right)$

$\left(\frac{2m+5}{m^2+1}\right)^4$