the value of tan(A/2)/(a-b)(a-c) +tan(B/2)/(b-c)(b-a) +tan(C/2)/(c-a)(c-b) is equal to
the value of tan(A/2)/(a-b)(a-c) +tan(B/2)/(b-c)(b-a) +tan(C/2)/(c-a)(c-b) is equal to

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