Solving Trig Equations for a Certain Domain

[Pre]

I'm not sure how to receive the answers in terms of pi to equations like in the attachment to a certain domain.

With no arguments, the answer (pi*n, ((4*pi*n)-pi)/4) is displayed. But to restrict to an interval like 0 to 2*pi, I can only find this (see picture).

   

Although the solutions are displayed, they are in numeric form. How can I display the exact answers (0, 3pi/4, pi, 7pi/4) on the calculator?

I am using Rev 6031 on the emulator.