$\frac{2\cdot sen^2\left(x\right)}{cos\left(x\right)}$
$\frac{243x^5-1024y^{10}}{4x+4y^2}$
$3x+6\left(2x+3\right)$
$\frac{\left(2x\right)^2-3^2}{2x+3}$
$\left(5a+11\right)\left(5a+13\right)$
$10x^2+20x+10$
$4x^2+6\le0$
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