If a+b+c = 0, then prove that (b+c)^2 / 3bc + (c+a)^2 / 3ca + (a+b)^2 / 3ab = 1

[Dhanalakshmi]

If a+b+c = 0, then prove that (b+c)² / 3bc + (c+a)² / 3ca + (a+b)² / 3ab = 1

[Dhanalakshmi]