Question

REPEDE Se considera expresia E(x)= (1/x-1 - 1/x+1 + 1/x^2-1 ) : 3/1-x^2 . Aratati ca E(x)=-1

Answer 1

E(x)= [1/x-1 - 1/x+1 + 1/(x²-1) ] : 3/(1-x²),  x≠1, x≠-1
E(x)=[x+1-(x-1)+1]/(x²-1):3/(1-x²)
E(x)=3/(x²-1):-3/(x²-1)
E(x)=-1