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The real factors of x$^4$ + 4 are ____
(A) (x$^2$ + 4) (x$^2$ + 4)
(B) (x$^2$ + 4) (x$^2$ - 4)
(C) (x$^2$ - 2x - 2) (x$^2$ + 2x + 2)
(D) Does not exist
 Answers: 5
  on 21/10/16
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