Factorise: x4 + 4x^2 + 16
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x^4+4*x^2+16
=x^4+8*x^2+16-4x^2
=(x^2)^2+2*x^2*4+4^2-4x^2
=(x^2+4)^2-(2x)^2
=(x^2+4-2x)(x^2+4+2x)
=(x^2+2x+4)(x^2-2x+4)
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