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
Ans:D
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