$\frac{-8a^2-12ab-4b^2}{b-a}$
$4x^6yz+14xy^2-21xy$
$3.8=2\sin\left(30x\right)\:+5$
$\frac{dr}{d\theta\:}\:=\left(r+e^{-\theta\:}\right)tan\:\left(\theta\:\right)$
$m^2+4mn+4n^2$
$\frac{3x+5}{x^2+3x+2}$
$4x+2=-8x+26$
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