[" In any "Delta ABC,(tan((A)/(2)))/((a-...

[" In any "Delta ABC,(tan((A)/(2)))/((a-b)(a-c))+(tan((B)/(2)))/((b-a)(b-c))+(tan((C)/(2)))/((c-a)(c-b))=],[[" 1) "Delta," 2) "(1)/(Lambda)," 3) "(2)/(Delta)]]

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