$\int\frac{x^2+4}{\left(x-2\right)\left(x+2\right)}dx$

$\int\frac{e^{\sqrt{x}}}{2\sqrt{x}}dx$

$\lim_{x\to\infty}\left(\frac{x\ln\:\left(\frac{x-8}{x}\right)}{4}\right)$

$\frac{a^2-7a+6}{-a^2+10a-6}$

$=12m^{3}-2m^{2}n$

$\lim_{x\to0}\left(\frac{2^x}{2.1^x}\right)$

$6x^3+7x^2-9x+2$