$\left(0\right)^2\:+\:2\left(0\right)\:+1\:$
$2\left(x+4\right)^2$
$\left(m^{x+1}+3\right)\left(m^{x+1}-7\right)$
$2^3\sqrt{16x^2} y^7$
$x^2+5x-1$
$\left(x^2+3x-4\right)x-2$
$6x-y+5x+y$
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