$-2^{-\left(-3\right)}+3$
$3x^4-4x^2+1$
$\frac{2x^2-2}{3x^2+6x+3}$
$\left(4a^3b^2\right)^2$
$z^{-2}\:\frac{4}{z^2}$
$\frac{x^3-5x+3}{x+1}$
$121x^2-4y^8$
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