# How do you evaluate #arccos (-1/3)#?

##### 2 Answers

Nov 28, 2015

Think of the line

#### Explanation:

The arccos function is only valid over the **range**

Below is a graph of the two functions. As you can see, the two functions intersect at

Using a *trigonometry calculator* , you can also enter the **inverse cosine** at

**radians**

Hope that helps

Nov 29, 2015

Evaluate arccos (-1/3)

Ans:

#### Explanation:

Use calculator.