Question

Let F(X)=x-1/X+1,then F(F(X)) is
(A) 1/x
(B) -1/x
(C) 1/X+1
(D) 1/x-1

Answer 1

Answer:

(x-1/x+1)-1/(x-1/x+1)+1

=x-1-x-1/x-1+x-1=-2/2x=-1/x