$\lim_{x\to1}\left(\frac{x^2-x}{x^2+1}\right)$
$\frac{dy}{dt}=\left(y+2\right)\left(y-4\right)$
$log\left(x\right)+log\left(x-5\right)=log\left(x^2-5x\right)$
$\left|-9\right|+10-4-8$
$\frac{s}{\left(s^2+4\right)\left(s^2+1\right)}$
$5\cos x=-2$
$2x^2-x+5$
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