$\int\:\frac{9x^2+55x-7}{x^3+7x^2}dx$

$\int\frac{x^2}{\left(x-3\right)\left(x^2+x+5\right)}dx$

$\lim_{t\to0}\left(\frac{\sqrt{2-t}-\sqrt{2}}{t}\right)$

$\lim_{x\to4}\left(\frac{3\left(x-4\right)}{4x}\right)$

$\int\frac{1}{\sqrt{2x+7}}dx$

$3x+7x+2x+x$

$\left(n^2+2n-3\right)\left(m^2\right)$