X^8 - y^8

Hi Kartik dear,  
x^8 - y^8 = (x^4)^2 - (y^4)^2 = (x^4 + y^4) (x^4 - y^4) 
==> (x^4 + y^4) (x^2 + y^2) (x^2 - y^2)
==> (x^4 + y^4) (x^2 + y^2) (x + y) (x - y)

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