$\left(3a^2+b\right)^3$
$\left(5x+4y\right)\left(5x+2y\right)$
$x^6-\:4x^3\:entre\:x$
$4x^2\left(y^4+4x^2h^2\right)$
$\sin\left(2y\right)\cos\left(y\right)$
$\left(\frac{3}{4}x-\frac{2}{3}y\right)\left(\frac{3}{4}x+\frac{2}{3}y\right)$
$15,2\:-\:7$
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