$\lim_{x\to\infty}\left(\frac{x+5}{x^2+2x-1}\right)$

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

$\int\left(x^2\left(6x^3-1\right)^4\right)dx$

$12^8\cdot12^{-6}$

$2x-3\ge x-1$

$-10\:\cdot4+80\cdot2$

$\lim_{x\to infinity}\left(\frac{1-\cos\left(2x\right)}{x}\right)$