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$\large\frac { { \left( b+c \right) }^{ 2 } }{ bc } +\frac { { \left( c+a \right) }^{ 2 } }{ ca } +\frac { { \left( a+b \right) }^{ 2 } }{ ab }$

If $a+b+c = 0$, what is the value of the expression above?

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