x power 6-64 factorize
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x^6 - 64
=> (x^2)^3 - (4)^3
=> ( x^2 - 4) [ (x^2) ^2 + 4^2 + 2(x^2) (4)]
=> (x +2) (x-2)( x^4 + 16 + 8x^2)
=> (x+2)(x-2)(x^4 + 8x^2 + 16)
=> (x^2)^3 - (4)^3
=> ( x^2 - 4) [ (x^2) ^2 + 4^2 + 2(x^2) (4)]
=> (x +2) (x-2)( x^4 + 16 + 8x^2)
=> (x+2)(x-2)(x^4 + 8x^2 + 16)
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