$45n^2+80n+120=20n^2-20n+20$
$\:cos^2x-sen^2x=2sen^2x-1$
$12abc-5-12abc+8$
$3\frac{dy}{dx}=-9x^2+3$
$3ax+3x+4y+4ay$
$\frac{d}{dx}\:\:\frac{x^2}{a^2}+\frac{y^2}{b^2}=3x^2y^3$
$\int\left(5.4e^{-4x+5}\right)dx$
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