Multiply: (x2+3)(x2−3)(x^2 + 3)(x^2 - 3)(x2+3)(x2−3).
x4−9x^4 - 9x4−9
x4+9x^4 + 9x4+9
x4−6x2+9x^4 - 6x^2 + 9x4−6x2+9
x4−3x^4 - 3x4−3