$81n^2-18n+1$
$4n+6$
$10-6+2-7-1-8$
$\int\frac{-9x+15}{\left(2x-5\right)\left(x+5\right)}dx$
$\left(x^2+3x+1\right)\left(x^2-5\right)$
$\int\frac{1}{\left(n+a\right)\left(n+a+1\right)\left(n+a+2\right)}dx$
$\frac{m^2+11m+30}{m+6}$
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