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\alpha ^{2}+2\alpha \beta +\beta ^{2}-2\alpha \beta
Utilize o teorema binomial \left(a+b\right)^{2}=a^{2}+2ab+b^{2} para expandir \left(\alpha +\beta \right)^{2}.
\alpha ^{2}+\beta ^{2}
Combine 2\alpha \beta e -2\alpha \beta para obter 0.
\alpha ^{2}+2\alpha \beta +\beta ^{2}-2\alpha \beta
Utilize o teorema binomial \left(a+b\right)^{2}=a^{2}+2ab+b^{2} para expandir \left(\alpha +\beta \right)^{2}.
\alpha ^{2}+\beta ^{2}
Combine 2\alpha \beta e -2\alpha \beta para obter 0.