$2\cos^2x+\cos\:x-1$
$x^2-4x-117=0$
$49x^2-98x+49$
$\left(y+2\right)\left(y+12\right)$
$\left(m+8\right)\left(xym-8\right)$
$\lim_{x\to0}\left(\frac{1}{\ln\left(x+1\right)}-\frac{1}{2}\right)$
$\left(a-b\right)\left(a-x\right)$
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