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4x^{2}+12xy+9y^{2}-1
Usar teorema binomial \left(a+b\right)^{2}=a^{2}+2ab+b^{2} para expandir \left(2x+3y\right)^{2}.
4x^{2}+12xy+9y^{2}-1
Usar teorema binomial \left(a+b\right)^{2}=a^{2}+2ab+b^{2} para expandir \left(2x+3y\right)^{2}.