$\frac{\left(x^4\:-\:6x^3\:-25x^2-5x\:+\:9\right)}{\left(x+3\right)}$

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

$\lim_{x\to\infty}\left(\frac{\left(6n-1\right)\left(6n+1\right)\left(8n+3\right)}{\left(72n^3+7\right)}\right)$

$x^2+21x+20<0$

$\left(x+1\right)^2+m\left(x+1\right)-y\left(x+1\right)$

$13-\left(-31\right)$

$\int4mx^8dx$