Answer :
The domain of y = cos x is (-∞, ∞) or the set of real numbers. The domain of a function refers to all the possible input values for which the function is defined.
In the case of the function y = cos x, the input values are the values of x. Since the cosine function is defined for all real numbers, the domain of y = cos x is the set of real numbers. This means that any real number can be plugged into the function y = cos x and a corresponding output value will be obtained. The domain is not restricted to any specific range or interval, and it is continuous. Therefore, the domain of y = cos x is (-∞, ∞) or the set of real numbers.
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