Here's the question you clicked on:
kk1022
How to use the t, O, n symbols in T1-83+ calculator??
What are you trying to do?
I'll go grab my calculator and see what you're talking about brb.
Oh, you mean T, theta, and n
T, theta, and n are used for different coordinate systems. Theta is used for polar coordinates.
On your calculator, hit the "mode" button.
On the 4th line down, you'll see func, par, pol, and seq. function, they use x. parametric, they use "t". polar, they use theta. Not sure about sequence (or sequential??)
Are you working with polar coordinates now?