Question 1 of 10
What is the domain of $y=\cos x$ ?
A. $x \neq n \pi$
B. $-1 \leq y \leq 1$
C. $x \neq \frac{\pi}{2}+n \pi$
D. All real numbers

Answer

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Answer

$\boxed{\text{The domain of } y = \cos(x) \text{ is all real numbers (D)}}$

Steps

Step 1 ：Given the function: $y = \cos{x}$

Step 2 ：The domain of a function is the set of all possible input values (x-values) for which the function is defined.

Step 3 ：For the cosine function, it is defined for all real numbers.

Step 4 ：$\boxed{\text{The domain of } y = \cos(x) \text{ is all real numbers (D)}}$