/sci/ - Science & Math

Im trying to graph f(x)=Cos(x) with the domain {0<= x <= 2pi}.
Im trying to get the Range(y) values using my calculator ( pic related ).
But I know what a Cos function looks like and its giving me back values
between 1 and 0.9945. If i sketch would look like a straight line. I think its
interpreting my values as degrees. Is there a certain syntax to get what Im after?
I know this going to come across as a stupid question but google just keeps giving me back American
calculators that graph it on screen.