Simplify x6−64x4−16\frac{x^6 - 64}{x^4 - 16}x4−16x6−64.
x2−4x^2-4x2−4
x2−2x+4x2+4\frac{x^2-2x+4}{x^2+4}x2+4x2−2x+4
x2+4x2−2x+4\frac{x^2+4}{x^2-2x+4}x2−2x+4x2+4
x4+4x2+16x2+4\frac{x^4+4x^2+16}{x^2+4}x2+4x4+4x2+16