Respuesta :
Answer:
all negative and positive angle measures.
Step-by-step explanation:

The domain of the cosine function is: all negative and positive angle measures.
What is domain of a function?
"It is a set of all possible input values for which a function is well defined."
We know,
A cosine function i.e., f(x) = cos(x) is defined for any real value of x.
This means, the domain of the cosine function is, all negative and positive angle measures.
Therefore, the correct answer is option (A).
Learn more about domain of cosine function:
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