$32sen^2x+4senx-1$
$108x^2y^2-40x^2y^2$
$\left(3.2+y\right)\left(0.5+y\right)$
$\left(9ab^2+5a^2\:b^3\:\right)^2$
$\frac{2}{\csc^2\left(x\right)}\:-\:2\tan^2\left(x\right)$
$12x^2-9x=0$
$\frac{x^3-x^3-2x-8}{2x+3}$
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