how to factorise x^-y^6
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a^2 - b^2 = (a + b)(a - b)
a^3 - b^3 = (a - b)(a^2 + ab + b^2)
a^3 + b^3 = (a + b)(a^2 - ab + b^2)
x^6 - y^6
= (x^3)^2 - (y^3)^2
= (x^3 + y^3)(x^3 - y^3)
= (x + y)(x^2 - xy + y^2)(x - y)(x^2 + xy + y^2)
a^3 - b^3 = (a - b)(a^2 + ab + b^2)
a^3 + b^3 = (a + b)(a^2 - ab + b^2)
x^6 - y^6
= (x^3)^2 - (y^3)^2
= (x^3 + y^3)(x^3 - y^3)
= (x + y)(x^2 - xy + y^2)(x - y)(x^2 + xy + y^2)
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