$\frac{8}{x^2-2x-15}$
$\lim_{x\to4}\left(\frac{x^2+3x+2}{x^2-1}\right)$
$2\log_{3}5=\log_{3}\square$
$\left(3a-b\right)\left(-a+b\right)$
$\cos\left(x\right)\left(\cos\left(x\right)-1\right)=0$
$3xy^2+7xy^2$
$5a-3b+7c+-3a+5c+5b$
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