(xy ^ 4)^m= x^my ^(4m)-(p^2q)^n=-p^(2n)q^n(xy^3n)^2+(xy^6)^n=x^2y^(6n)+x^ny^(6n)=(x^2+x^n)y^(6n)(-3x^3)^2-[(2x)^2]^3=9x^6-4x^6=5x^6