(A+B+C)^2 =
A² + AB + AC + BA + B² + BC + CA + CB+ C² = A² + B² + C² + 2AB + 2AC +2BC
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(A+B+C)^2 =
A² + AB + AC + BA + B² + BC + CA + CB+ C² = A² + B² + C² + 2AB + 2AC +2BC