what are the factors of x^4+4
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consider it as (Xsquare)^2+2^2 then by
a^2+b^2=(a+b)^2 - 2ab we get...
(Xsquare+2)^2 -4x^2
a^2+b^2=(a+b)^2 - 2ab we get...
(Xsquare+2)^2 -4x^2
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