( x + i y ) ^ { 3 } = u + i v , \text { then show that } \frac { u } { – InterviewSolution

1.	( x + i y ) ^ { 3 } = u + i v , \text { then show that } \frac { u } { x } + \frac { v } { y } = 4 ( x ^ { 2 } - y ^ { 2 } )
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