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Se considera expresia E(x) =(x²-1):(x+x²-4/2x-4 * 2x+4/x²+4x+4) unde x apartine de {- 4,-2,1,4}. a) Arata ca x^2-5x+4=(x-1)(x-4) pt orice nr real x b) Arata ca E(x) = (x+2)(x+4)/3(x-1) oricare ar fi x apartine de R \{-4,-2,1,4}​