$\sqrt{20\cdot21\cdot22\cdot23+1}$
$\left(4a-5\right)\left(4a+9\right)$
$3-9+4-8-2+13$
$81-64b^{10}$
$3x^2+xy^3$
$45x^2y^2+30xy^3+5y^4$
$\frac{\left(49y^2\right)}{\left(7y^8\right)}$
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