SOLUTION: When can the function f(x+2) be equal to the function f(x)

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Question 1070447: When can the function f(x+2) be equal to the function f(x)
Answer by ikleyn(52857) About Me  (Show Source):
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If f(x+2) is equal to f(x) as functions (meaning "for all x"), it means that f(x) is periodical with the period of x.

A particular case of it is f(x) = constant.