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Ab c. A 2 B 2 C 2 2ab 2bc 2ac. 1/4a2-ab+b2. 4b2 - ab. A2+b2-c2/2ab.
A 2 B 2 C 2 2ab 2bc 2ac. 1/4a2-ab+b2. 4b2 - ab. A2+b2-c2/2ab.

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