$\int\frac{-2x+6}{x\left(x^2-1\right)}dx$
$\int\frac{x^3}{\left(49+x^2\right)}dx$
$5n\:+\:3\:+\:8n$
$\lim_{x\to-4}\left(\frac{20}{\sqrt{5x+1}-1}\right)$
$\left(2^3\right)^3$
$\frac{\sin\left(b\right)\:}{1+\cos\left(b\right)}+\frac{1-\cos\left(b\right)}{\sin\left(b\right)}$
$4x^2-9x-9$
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