(2x2-1)(2x2+9), 4x4+16x2-9, (2x2+9)2, 4x4+36x2+81, (2x2-3)2, 4x4-12x2+9, (x-3)(x2-7)(x+3), x4-16x2+63, (x+3)(x-3)(x2+9), x4-81, (x-2-z)(2+x-z), x2-2zx+z2-4, (2-z+x)(x+z-2), x2-4+4z-z2, (z-2+x-y)(y-2+x-z), x2-4x+2zy-z2-y2+4, (x-y-z)2, x2-2xy+2zy+z2-2xz+y2, (x-2)(x2-5)(x+2), x4-9x2+20, (x2+y)(x4-x2y+y2), x6+y3, (x2+y2)(x4-x2y2+y4), x6+y6, (x2-y)3, x6-3x4y+3x2y2-y3, (x2+y)3, y3+3x2y2+3x4y+x6, (x+y)(x3-y3)(x2-xy+y2), x6-y6, (2-x-y)(x+y-2), -4-x2+4x-2xy-y2+4y, (x2-4)2, x4-8x2+16, (x-2y)(x3+4y3)(x2+2y+4y2), x6-4x3y3-32y6, (1-x)(1+x)(1+x2)(1-x3), 1-x3-x4+x7, (x3-1)(x3+8), x6+7x3-8.

Identity

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