# How do you find the exact value of #cos[arc tan(-2/3)]#?

##### 2 Answers

Jun 12, 2015

The exact value is apparently

However, you'll have to use a calculator to find

which doesn't really give a satisfactory exact answer (such as

If you just take this exact result and take the

Jun 14, 2015

Find

#### Explanation:

Calculator gives;

Therefor,