Suppose i have a sprite moving across the screen from left to right, and i want to press a button and it will make a large sweeping arc and change its direction 180°.
this would be its trajectory:
Start:
---->---
            \
             )
            /
---<----
^End

now i'm wondering how i could implement this in axe. keep in mind i want this to be free of any sort of gravity, so the sprite is moving at a constant velocity and all i want to do is change its direction.

yeah, it's summer. all the math i learned last year (which included sin cos tan  ) has been forgotten

If I knew more about the cos( and sin( functions in Axe I would help. Unfortunately I haven't much. Maybe later.

You spelled it right.
Since Axe doesn't support floating point numbers, it uses neither Degrees nor Radians. Rather, the input, in range 0-255, corresponds to 0-2*pi radians and the output, in range -128 to 127, corresponds to -1-1.
Edit: 300^th post!

idea: have an x and y velocity, and make sure they ALWAYS add up to 100. then when the user presses a key, you change one of the velocities, thus changing the other. so 50/50 would make the sprite move at a 45 degree angle, while 25 Y velocity with 75 X velocity would make the sprite move at a 22.5 degree angle. i'm not sure if the sprite would move at a constant speed though... you'd have to do some division tricks as well, so you can get good precision.

Ya, that routine works for the most part (you do need to change Pt-On( to Pxl-On( and put a DispGraph at the end). Only thing is that the circle produced is sort of square-ish.

Edit:
Here is a screenshot of what I mean.

Edit 2:
Here is one with a sprite.

Also, glad you got use from it, nemo.

Nice circle!  Great job calcdude and meishe!

Wow, despite not looking 100% perfect (the later screenshot) it sure draws circles friggin fast!

Sadly I can't help much though because we did not do a lot of trig at school (it was only people who had advanced maths classes) and most was forgotten since my last math class was 7 years ago