x/y+y/x=-1
find x³-y³
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x/y+ y/x = -1
x²+y²/xy = -1
x²+y² = -xy
x³+y³= (x-y)(x²+ y²+xy)
= (x-y)(-xy+xy)
=x-y ans..
x²+y²/xy = -1
x²+y² = -xy
x³+y³= (x-y)(x²+ y²+xy)
= (x-y)(-xy+xy)
=x-y ans..
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