$\int\:\left(2x+x^3\right)^2\cdot\:\left(6+9x^2\right)dx$
$20n^2-45n$
$\lim_{t\to-1}\left(\frac{t^2-2t+1}{t^3+3t^2+3t+1}\right)$
$\int\frac{5-x}{2x^2+x-1}dx$
$\left(5d+1\right)+\left(8d+4\right)$
$\frac{x^2+6x+12}{x-4}$
$\int\frac{-4x^3+2x}{x^3}dx$
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