20121220444
x^8-y^8
=(x^4)^2-(y^4)^2
=(x^4+y^4)(x^4-y^4)
=(x^4+y^4)[(x²)²-(y²)²]
=(x^4+y^4)(x²+y²)(x²-y²)
=(x^4+y^4)(x²+y²)(x+y)(x+-y)
20121220444
x^8-y^8
=(x^4)^2-(y^4)^2
=(x^4+y^4)(x^4-y^4)
=(x^4+y^4)[(x²)²-(y²)²]
=(x^4+y^4)(x²+y²)(x²-y²)
=(x^4+y^4)(x²+y²)(x+y)(x+-y)