Calculation: (B-C) / (A & # 178; - AB AC + BC) - (C-A) / (B & # 178; - BC AB + AC) + (a-b) / (C & # 178; - AC BC + AB)

Calculation: (B-C) / (A & # 178; - AB AC + BC) - (C-A) / (B & # 178; - BC AB + AC) + (a-b) / (C & # 178; - AC BC + AB)

The denominator is (a-b) (B-C) (A-C). The polynomial is: (a-b) &# 178; + (B-C) &# 178; + (C-A) &# 178; / (a-b) (B-C) (A-C). Expand the molecule and arrange the molecule = 2B & # 178; - 2BC + 2ac-2ab = - 2 (a-b) (B-C)
The original formula = - 2 (a-b) (B-C) / (a-b) (B-C) (A-C) = - 2 / (A-C)