$a^2+2ab$
$\int_0^{\pi}\left(1+sen\:x\right)dx$
$\left(-6\right)\cdot\left|\left(-7\right)+\left(+3\right)-\left(7+6-14\right)\right|-\left(+7\right)+\left(+3\right)$
$6x^2-8x+2$
$\frac{x^2+2x+4}{-4x^2-20x-16}$
$x-4+3x-2$
$-12.75-0$
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