$\int4x\:in\:2x\:dx$
$-7a-3a-2a$
$\lim_{x\to2}\left(\frac{x^3-8}{ln\left(x-1\right)}\right)$
$x^2+20x+100=0$
$6x-4x=4x$
$mx\left(2x-1\right)\left(2x+5\right)$
$\sec x+\cos^2x$
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