For which of the following functions f is f(x)=f(1-x) for all x?
A. f(x)=1-x
B. f(x)=1-x^2
C. f(x)=x^2 - (1-x)^2
D. f(x)=x^2 (1-x^2)
E. f(x)=x/(1-x)
A. f(x)=1-x
B. f(x)=1-x^2
C. f(x)=x^2 - (1-x)^2
D. f(x)=x^2 (1-x^2)
E. f(x)=x/(1-x)
