Question

question 21 of 30
which function has a period of π?
a. $y = cot x$
b. $y = csc x$
c. $y = sin x$
d. $y = cos x$

Explanation:

The period of trigonometric functions: $\cot x$ has a period of $\pi$; $\csc x$, $\sin x$, and $\cos x$ have periods of $2\pi$.

Answer:

A. $y = \cot x$