$8\left(x^2-3x\right)$
$\lim_{x\to0}\left(\frac{1}{cosx}lnx\right)$
$x2\:+x+\:x+x+1$
$y^2+y^2$
$50a+12b+4b+10a-8b+100ae$
$\sqrt{1}+2$
$x<x^2+2x+1$
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