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((a-b+c)(a+b-c))/((a-b)(a-c) ) + ((b-c+a)(b+c-a))/((b-c)(b-a) ) + ((c-a+b)(c+a-b))/((c-a)(c-b) )
((a-b+c)(a+b-c))/((a-b)(a-c) ) + ((b-c+a)(b+c-a))/((b-c)(b-a) ) + ((c-a+b)(c+a-b))/((c-a)(c-b) )
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