Factor
\frac{9\left(2x^{n}+1\right)^{2}-4xy^{2}}{36}
Evaluate
\frac{\left(2x^{n}+1\right)^{2}}{4}-\frac{xy^{2}}{9}
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\frac{36x^{2n}+36x^{n}-4xy^{2}+9}{36}
Factor out \frac{1}{36}.
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