Which domain window settings would be appropriate if you wanted to graph the function below in radians for exactly two periods?f(x) = cos(x)

The cosine function has a period of 2π radians, so two periods span 4π radians. The interval from −π to 3π has length 3π − (−π) = 4π, which shows exactly two periods. Therefore, the appropriate settings are Xmin = −π and Xmax = 3π, choice D.

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