$\lim_{x\to-\infty}\left(\frac{-2x+7}{\sqrt{2x^2-3x+1}-2x}\right)$

$\frac{dy}{dx}=\frac{x+5}{x-2}$

$4x+6y-3xy+4y-5x-2xy$

$\left(\frac{x}{2}-10\right)^2$

$\int\:\frac{sen\left(\frac{1}{x}\right)cos\left(\frac{1}{x}\right)}{x^2}dx$

$\frac{2^n}{2+3^n}\left(x+2\right)^n$

$\int s^5\left(6+s^6\right)^5ds$