(a^3 (b+c))/((a-b)(a-c)) + (b^3 (c+a))/((b-c)(b-a)) + (c^3 (a+b))/((c-a)(c-b))a3(b+c)(a−b)(a−c)+b3(c+a)(b−c)(b−a)+c3(a+b)(c−a)(c−b)
hArr-(a^3(b+c))/((a-b)(c-a))-(b^3(c+a))/((b-c)(a-b))-(c^3(a+b))/((c-a)(b-c))⇔−a3(b+c)(a−b)(c−a)−b3(c+a)(b−c)(a−b)−c3(a+b)(c−a)(b−c)
or -(a^3(b+c)(b-c)+b^3(c+a)(c-a)+c^3(a+b)(a-b))/((a-b)(b-c)(c-a))−a3(b+c)(b−c)+b3(c+a)(c−a)+c3(a+b)(a−b)(a−b)(b−c)(c−a)
or -(a^3(b^2-c^2)+b^3(c^2-a^2)+c^3(a^2-b^2))/((a-b)(b-c)(c-a))−a3(b2−c2)+b3(c2−a2)+c3(a2−b2)(a−b)(b−c)(c−a)
or -(a^3(b^2-c^2)-a^2(b^3-c^3)+b^2c^2(b-c))/((a-b)(b-c)(c-a))−a3(b2−c2)−a2(b3−c3)+b2c2(b−c)(a−b)(b−c)(c−a)
or -((b-c)[(a^3(b+c)-a^2(b^2+bc+c^2)+b^2c^2]))/((a-b)(b-c)(c-a))−(b−c)[(a3(b+c)−a2(b2+bc+c2)+b2c2])(a−b)(b−c)(c−a)
or -((a^3b+a^3c-a^2b^2-a^2bc-a^2c^2+b^2c^2))/((a-b)(c-a))−(a3b+a3c−a2b2−a2bc−a2c2+b2c2)(a−b)(c−a)
or -(c^2(b^2-a^2)+c(a^3-a^2b)+a^3b-a^2b^2)/((a-b)(c-a))−c2(b2−a2)+c(a3−a2b)+a3b−a2b2(a−b)(c−a)
or -(c^2(b-a)(b+a)+ca^2(a-b)+a^2b(a-b))/((a-b)(c-a))−c2(b−a)(b+a)+ca2(a−b)+a2b(a−b)(a−b)(c−a)
or -(-c^2(b+a)+ca^2+a^2b)/((c-a))−−c2(b+a)+ca2+a2b(c−a)
or -(b(a^2-c^2)+ac(a-c))/((c-a))−b(a2−c2)+ac(a−c)(c−a)
or b(a+c)+acb(a+c)+ac
or ab+bc+caab+bc+ca
