$36ab+60b$
$\left(x+3y\right)\left(x^3-9y^3\right)$
$\frac{d}{dx}\frac{x}{x+1}$
$3a+b\:para\:a=2\:y\:b=-3$
$xy'-xy=y$
$0^2\arcsec0$
$-3\left(x^4+2x^2+15\right)$
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