Question #30286

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1 Answer
kumail
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.

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