$\left(-e^xsenx\right)^2$
$\left(2x\right)^2-y^2$
$x^2x+x^2z$
$5x^2-45x+30=0$
$3x^2-12x+6=0$
$\left(\frac{2}{x}-\frac{3}{y}+\frac{2}{z}=5\right)$
$\sqrt[3]{x^2}-\sqrt[3]{x}+1$
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