fractorise the equation .
x4 +3x2 +4
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x^4+3x^2+4
x^4-x^2+4x^2+4
x^2(x^2+1)+4(x^2+1)
(x^2+1)(x^2+4)
x^4-x^2+4x^2+4
x^2(x^2+1)+4(x^2+1)
(x^2+1)(x^2+4)
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