$\frac{x^2-9x-10}{x^2+8x-9}$
$\left(\frac{1}{2}a\:+\frac{2}{3}b\:\right)\left(\frac{1}{2}a\:-\:\frac{10}{3}b\right)$
$\frac{\cos2a}{\cos a+\sin a}$
$\int\sin^3\left(z\right)dz$
$5\left(x\:+\:2\right)$
$\left(a-11x\right)\left(a+10\right)$
$\left(x-1\right)\left(x-6\right)$
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