$\frac{2^{\left(2n\right)}}{3^{n+1}}$
$a^{12}-a^6b^3+4a^4b^2-2a^2b\:+a^2$
$-4\left(-4a+6\right)$
$\sqrt{4^2}+x^2$
$5x^2-7x+2+\frac{49}{5}$
$\left(17m^4\right)^2$
$x^4-2x^3-2x^3+x$
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