What is the domain of f(x)=cosxf(x)=cosx?

1 Answer
F. Javier B.
Mar 23, 2018

Domain of f(x)f(x) is RR. See below

Explanation:

f(x)=cosx is a circular function defined in the goniometric circle by x coordinate. Thus is defined for all positions in that circle. But f(x) repeat his values each lap. For this reason, we say cosx is a periodic function. See the graph graph{cosx [-12.66, 12.65, -6.33, 6.33]}

The range of cosx is (as we can see in graph) [-1,1]

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