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Se considera functia f : R → R , f(x) = x – x3 calculati (f °f)(-1)
rog frumos , putin ajutor


Răspuns :

fof=f(f(x))=x-x^3-(x-x^3)^3=x-x^3-x^3+3x^5+3x^7+x^9=x-2x^3+3x^5-3x^7+x^9
(fof)(-1)=-1+2-3+3-1=0