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[" If "a_(i),b,c" are all nonzero and "a+b+c=0" ,prove the "],[qquad (a^(2))/(bc)+(b^(2))/(ca)+(c^(2))/(ab)=3]

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If a,b,c are all non-zero and a+b+c=0 prove that (a^(2))/(bc)+(b^(2))/(ca)+(c^(2))/(ab)=3

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