# How do you evaluate #cos^-1(cos((pi)/10))#?

##### 1 Answer

Dec 12, 2016

The answer is

#### Explanation:

By definition,

(1)

(2)

In our case

For this

Therefore, the answer is

Dec 12, 2016

The answer is

By definition,

(1)

(2)

In our case

For this

Therefore, the answer is