Let f1(x)={x, x leq x leq 1 and 1 x gt1...

Let `f_1(x)={x, x leq x leq 1 and 1 x gt1 and 0`,otherwise `f_2(x) =f_1 (-x)` for all x abd `f_3(x)=-f_2(x)` for all x and `f_4(x)=-f_3(-x)` for all x Which of the following is necessarily true?

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