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Hlo freinds...^_^pls solve it ...

Answer»

(x/y)+( y/x)= -1
(x^2+ y^2)/XY= -1
x^2+y^2= -xy
x^2+ y^2+xy = 0

so, x^3-y^3= (x-y)(x^2+y^2+xy)
= (x-y)× 0
=0 is ANSWER



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