Question

What is the domain of y = cos θ?

A. [-1, 1]
B. [0, infinity]
C. All real numbers
D. 2pi,

Answer 1

The domain of y = cos θ is all real numbers. This is because any real number can be plugged in for θ and y will be equal to a real number. This can be shown graphically because the y = cos θ will go on infinitely both to the right and left.

Answer 2

Option C - All real numbers

Explanation:

Given : Function
`y=\cos \theta`

To find : The domain of given function ?

Solution :

Domain is defined as the set of values for which function is defined.

We have given the function,

`y=\cos \theta`

We know, for any value of
`\theta` the function
`y=\cos \theta` is defined.

Which means the set of all real numbers defined the given function i.e.
`x\in(-\infty,\infty)`

Therefore, Option C is correct.

The domain of
`y=\cos \theta` is all real numbers.