x + y + z = 0 \text { then } \frac { x ^ { 2 } } { y z } + \frac { y ^ – InterviewSolution

1.	x + y + z = 0 \text { then } \frac { x ^ { 2 } } { y z } + \frac { y ^ { 2 } } { z x } + \frac { z ^ { 2 } } { x y }
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