Question

The domain of y = cos x is _______.

a. -1 < x < 1
b. -1 < y < 1
c. x ≥ 0
d. the set of real numbers

Answer 1

d. The set of all real numbers

Step-by-step explanation

The basic cosine function ,

`y = \cos(x)`

is continuous everywhere.

The function is defined for all real values of x.

The domain is the set all values of x that will make the function defined.

The domain is all real numbers.

The correct choice is D.