Factories the given expression
x⁴+4/x²
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=(x^2)^2+(2/x)^2
=(x^2+2/x)^2-4x
=(x^2+2/x)^2-(2rootx)^2
=(x^2+2/x+2rootx)(x^2+2/x-2rootx)
HENCE FACTORISED
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