$-2x^2-5x-2$

$\frac{10}{2x+6}=\frac{3}{2x+6}$

$\frac{2x^5+16x^4-9x^3-18x^2+9x-9}{2x^2+0x-3}$

$\int_{-\infty}^{-9}\left(\frac{80}{x^2-64}\right)dx$

$\frac{2^2-x^2}{2+x}$

$\int_0^{\infty}\left(\frac{e^{-\frac{1}{x}}}{x^2}\right)dx$

$\lim_{x\to\infty}\left(\sqrt{\frac{1}{x}}\right)$