If x/y + y/x=-1 (x,y≠0) then find the value of

Question : If x/y + y/x=-1 (x,y≠0) then find the value of x³-y³?

Doubt by Radhika

Solution : 

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If x/y + y/x=1 (x,y≠0) then find the value of x³+y³?