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Factorize x^4+4...

Factorize `x^4+4`

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`=> x^4 +4`
`(x^2)^2 + (2)^2`
`= (x^2)^2 + (2)^2 + 2(x^2)2 - 2(x^2)2`
`= (x^2 +2)^2 - (2x)^2 `
using `(a+b)^2 = a^2 + b^2`
now by using `a^2 - b^2 = (a+b)(a-b) `
`= (x^2 +2+2x)(x^2+2-2x)`
answer
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