if a+b+c=0 and a^2+b^2+c^2=16fint ab +bc+ca
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(a+b+c)=0
(a+b+c)²=0
a²+b²+c²+2ab+2bc+2ca=0
16+2(ab+bc+ca)=0
ab+bc+ca=-16/2=-8
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