Question #30286

1 Answer
Jul 9, 2017

Because the cos function repeats its values every 360 degrees or 2pi radians.

Explanation:

This can be seen clearly in a graph of f(x) = cos(x) graph{cos(x) [-10.205, 9.785, -4.33, 5.67]}

The graph above is in radians so the values are seen repeating every 2pi units (6.3), which is the same as 360 degrees.