What calculator mode should i use to get answers like this?

Question

I have question cosx=1:2

Im in radian mode which is where im supposed to be i know for sure, but i have a problem. 

Instead of getting an answer like my classmates- pie:3 

I get the sulotion of pie:3- 1.047

My teacher says we all have to be in radian mode, and i know that im on radian mode, and everyone else is too. but why do i get answers like this? Im not allowed to use answers like this please help me i have test in a fyu days.

My question is: how do i make my answers appear like pie:3 and not 1.047?? 

Thank you! 

(I have bad spelling because i dont live in english speaking country im sorry)

Answer 1

In radian mode, cos^-1(1/2) = 1.047

In degree mode, cos^-1(1/2) = 60º

60º = π/3