# What is the amplitude, period and the phase shift of y = cos 2x?

##### 1 Answer
Nov 13, 2015

No phase shift because there is nothing added or subtracted from $2 x$

#### Explanation:

Amplitude $= 1$, from the coefficient on cosine

Period $= \frac{2 \pi}{2} = \pi$, where the denominator (2) is the coefficient on the variable x.

hope that helped