A function is said to be periodic if there exists some nonzero real number p, called the period, such that f(x + p) = f(x) for all real numbers x in the domain of f. Explain why no periodic function is one-to-one.

Algebra and Trigonometry (MindTap Course List)
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Author:James Stewart, Lothar Redlin, Saleem Watson
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Chapter6: Trigonometric Functions: Unit Circle Approach
Section6.4: More Trigonometric Graphs
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A function is said to be periodic if there exists some nonzero real number p, called the period, such that f(x + p) = f(x) for all real numbers x in the domain of f. Explain why no periodic function is one-to-one.

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