[BUG] - θ not displayed properly on CAS screen

[Matt]

Thanks for your comments so far. I should have checked the old forum first.

Theta does appear in the emulator (with latest firmware) just not the actual calculator.
As Mark said, you can't close an app. If you run the Parametric app then go to CAS and press 'x t θ n' you should get 't'. Run the Sequence app, switch to CAS and you'll get 'n'.
I think of it as the independent variable button.

But only 'x' works as a CAS variable.
So if you were in the Parametric app, then went to CAS and did diff(SIN(t)) you'll get 0 rather than COS(t).