$x^2-8x+4=0$
$x^2-16x+11$
$\int_0^{\frac{1}{2}}\left(sen\sqrt{x}\right)dx$
$\left(2x^2-2x+5=0\right)$
$\left(4+a\right)\left(1-a\right)$
$\left(b^7\right)\left(b-2\right)$
$\frac{-2x}{x}$
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