$\left(x^2+x-6\right)^2$
$1ab+6a-b^2-3b$
$\lim_{n\to+\infty}\left(1+e^{-nx}\right)$
$-12-9a-5-4a$
$3xy-7x-12y+28$
$\cos^{4}\left(a\right)-\sen^{4}\left(x\right)=2\cos^{2}\left(a\right)-1$
$\left(5m^2\right)\left(3m\right)$
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