[a/bc+b/ca+c/ab]²- write expanded form
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[a/bc+b/ca+c/ab]²
= [(a/bc)^2 + 2.(a/bc).(b/ca + C/ab) + (b/ca + C/ab)^2]
= (a/bc)^2 + 2.(a/bc.b/ca + a/bc.C/ab) + (b/ca)^2 + 2.(b/ca).(C/ab) + (C/ab)^2
= (a/bc)^2 + 2/c^2 + 2/b^2 + (b/ca)^2 + 2/a^2 + (C/ab)^2
= (a/bc)^2 + (b/ca)^2 + (C/ab)^2 + 2 (1/a^2 + 1/b^2 + 1/c^2) (ans.)
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