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[tex] {x}^{4} + 4 {x}^{2} + 4 = (locliber + 2) {}^{2} [/tex]



Răspuns :

[tex]\it x^4+4x^2+4=(x^2)^2 +2\cdot2\cdot x^2 +2^2=(x^2+2)^2[/tex]