# How do you use a calculator to evaluate #cos^-1 (0.55)# in both radians and degree?

##### 1 Answer

Apr 13, 2018

On most trig function calculators, 2nd > cos (this should give you cos^-1) and input your values.

#### Explanation:

To change the mode of your calculator, hit mode and you should be able to scroll down to change to and from degrees and radians.