(x⁴ - y⁴) / (2x-y) × (2xy - y²) / (xy -y²) ÷ [ (x²+y²) / (xy) ]² × 1/(x+y)= (x²+y²)(x+y)(x-y) / (2x-y) × y(2x-y) / [ y(x-y)] × x²y² / (x&#...