x⁶ - y⁶ = (x³)² - (y³)² = (x³ - y³)(x³ + y³) = (x - y)(x² + xy + y²)(x + y)(x² - xy + y²) =
= (x - y)(x + y)(x² - xy + y²)(x² + xy + y²)
x⁶ - y⁶ = (x³)² - (y³)² = (x³ - y³)(x³ + y³) = (x - y)(x² + xy + y²)(x + y)(x² - xy + y²) =
= (x - y)(x + y)(x² - xy + y²)(x² + xy + y²)