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A complete factorisation of x^(4)+64 is ...

A complete factorisation of `x^(4)+64` is :

A

`(x^(2)+8)^(2)`

B

`(x^(2)+8)(x^(2)-8)`

C

`(x^(2)-4x+8)(x^(2)-4x-8)`

D

`(x^(2)+4x+8)(x^(2)-4x+8)`

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