y^2 (y-q)-q^2 (y-q)=(y-q)( y^2-q^2)=(y-q)(y-q)(y+q)=(y-q)^2 ×(y+q)
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y^2 (y-q)-q^2 (y-q)=(y-q)( y^2-q^2)=(y-q)(y-q)(y+q)=(y-q)^2 ×(y+q)