If (x+iy)^(3) = u + iv, then show that u...

If `(x+iy)^(3) = u + iv`, then show that `u/x + v/y = 4(x^(2)-y^(2))`

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NCERT GUJARATI-COMPLEX NUMBERS AND QUADRATIC EQUATIONS -MISCELLANEOUS EXERCISES ON CHAPTER 20

If (x+iy)^(3) = u + iv, then show that u/x + v/y = 4(x^(2)-y^(2))
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