$\int\frac{3x-37}{\left(x+1\right)\left(x-4\right)}dx$

$\frac{10^{-11}}{10^{-1}}.\frac{10^2}{10^4}$

$\frac{d}{dx}\left(\frac{9x^2+4}{x^2+7}\right)$

$\frac{x-4}{x\left(x-4\right)}$

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

$\:\frac{\left(7^2\right)}{7^2}^5$

$\int_0^e\left(lnx\right)^2dx$