If x/y +y/x = -1, x,y ≠ 0 . find x 3 - y 3
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(x/y) + (y/x) = –1
x² + y² + xy = 0
x³ – y³ = (x+y) ×(x² - xy + y²) = 0
x² + y² + xy = 0
x³ – y³ = (x+y) ×(x² - xy + y²) = 0
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