The table provides various values, including select minimums and maximums, of a particular cosine function f (x). Angle −2π −π   0   π 2π f (x) 4 1   −2   1 4 What is the period of the function that contains these points?

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Q: (c) 4x = 5 (mod 15) 8x = 11 (mod 18)

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