Hi there.
I'm using mIRC 7.17 and when I do //echo -a $sin(30°) or //echo -a $sin(30) [0.5]
mIRC returns -0.988032
Why?

Same for //echo -a $cos(60°) [0.5 again]
mIRC returns -0.952413

I really don't know why. Is it a bug or what?

Thanks in advance