Question

If (1/a)+(1/b)+(1/c)=0 Then find- [a^2+b^2+c^2-ab-bc-ca]/(a+b+c)^2

Answer 1

1/a+1/b+1/c=0
ab+bc+ac/abc=0
ab+bc+ac=0

Apply this in the question the answer will be 1

1 is answer