Additivity defect of `C(·,2)`: `C(r + s, 2) = C(r,2) + C(s,2) + r s`. · Prove2Me

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Initializing...

Additivity defect of `C(·,2)`: `C(r + s, 2) = C(r,2) + C(s,2) + r s`. · Prove2Me