a b c 9 and a2 b2 c2 29 find ab bc ca, a2 b2 c2 ab bc ac, a 2+b 2+c 2-ab-bc-ca, a 2 b 2+bc, a 2+b 2+c 2-ab-bc-ca 0, a2+b2+bc-ca-2ab, a 2+b 2+c 2-ab-ac-bc, a2 b2+c2-bc, a+b+c 2 3 ab+bc+ca, a2-ab+ac-bc, a2-c2 bc, bc2+a2c+ab2-a2b-ac2-b2c, bc2+ca2+ab2-ba2-ac2-cb2, a2+b2+c2-ab-bc-ac 0, a2-b2 bc
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