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A2 b2 c2. 2 Ab BC AC. A 2 B 2 C 2 2ab 2bc 2ac. -BC/(a2+b2+c2). A^2b+b^2c+AC^2-ab^2-BC^2-AC^2.
2 Ab BC AC. A 2 B 2 C 2 2ab 2bc 2ac. -BC/(a2+b2+c2). A^2b+b^2c+AC^2-ab^2-BC^2-AC^2.

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