$12x^2+3xy$
$\frac{4x^2-49y^2}{2x+7y}$
$\frac{x^3-4x}{x^3+4x^2+4x}$
$\sqrt{\frac{x-5}{x^6+1}}$
$-50\cdot5$
$\left(\frac{y}{2}-yz\right)^2$
$2Sen^2\theta+Sen\theta-1=0$
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