$3x^2y+6xy$
$\frac{dy}{dx}sen2x=2\left(y+cosx\right)$
$\lim_{x\to2}\left(\frac{x^3+x^2+2x}{x^2-x-6}\right)$
$x^3+\left(4y\right)^3-8xy$
$\left(2z+y\right)\left(2z-y\right)$
$\left(\frac{a}{2}+5y\right)\left(\frac{a}{2}-5y\right)$
$2\left(4x-3\right)+7$
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