# How do you find the critical points to graph #y = -½ cos(π/3 x)#?

##### 1 Answer

Oct 26, 2016

#### Answer:

Critical points are

#### Explanation:

A critical point of a differentiable function is any point on the curve in its domain, where its derivative is

Now as domain of

it is

or

graph{-1/2cos(pi/3x) [-20, 20, -2, 2]}

i.e. at