$\int\frac{3}{x^{2}-1}dx$
$x^2-12x-18$
$a^{2}+20a+10$
$2\cos\left(x\right)-2$
$\int\frac{x+5}{x^2+x+6}dx$
$\lim_{z\to k}\frac{\pi\left(z-k\right)\cos\left(\pi z\right)}{z^2\sin\left(\pi z\right)}$
$-8\left(7+5x\right)$
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