If $(a+b+c)=0$, then $left(frac{a^{2}}{b c}+frac{b^{2}}{c a}+frac{c^{2}}{a b} ight)$ is

If a + b+ c = 0

a³ + b³ + c³ – 3abc = 0

Expression $=frac{a^{2}}{b c}+frac{b^{2}}{c a}+frac{c^{2}}{a b}$

$=frac{a^{3}+b^{3}+c^{3}}{a b c}=frac{3 a b c}{a b c}=3$