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

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

Doubt by Mehak 

Solution : 

Similar Question : 

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