$\lim_{x\to-1}\left(\frac{x^2-9}{x^2-3}\right)$
$a^2+6ab^2+ab^4$
$( a b + 4 ) ( a b - 3 )$
$\left(-24\right)\left(-6\right)$
$\sin^245^{\circ\:}-\cos\:^245^{\circ\:}$
$24-\:\left(-6\right)$
$\int\frac{3y-1}{y^2-y-12}dy$
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