$x^2+5x+49$
$\left(3^{3n}\right)^3$
$9t^2-2t$
$\left(11+\frac{1}{y}\right)\left(-11+\frac{1}{y}\right)$
$\frac{5^4}{5}$
$729x^{15}-216y^{12}$
$\lim_{x\to2}\left(\frac{2x^2+3x-2}{x^3-2x^2-3x+6}\right)$
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