Expand the expression $\left(x^{2n}+5y^{3m}\right)^2$ using the square of a binomial
Take the square of the first term: $x^{2n}$
Twice ($2$) the product of the two terms: $x^{2n}$ and $5y^{3m}$
Take the square of the second term: $5y^{3m}$
Add the three results, and we obtain the expanded polynomial
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