factorise x^4 + 1/x^4
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Hii its tom85
(x^2 + 1/ x^2)^2 - (sqrt2 )^2
x^2 + 1/x^2 - sqrt2 )((x^2 + 1/ x^2 + sqrt 2)
using
(x^2 + 1/ x^2)^2 = x^4 + 1/ x^4 + 2
x^4 + 1/ x^4 = (x^2 + 1/ x^2)^2 - 2
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