Capture the Trig Function from an Option Menu Button

[Roger Guay]

I know this is probably a stupid question, but I can't seem to make it work:

I have an Option Menu button with sin, cos, tan as menu Items. I want my card script to take the label of that button, and then perform the trig function with that label. I've tried every thing I can think of to "get", "do" or in general  assemble the script, but to no avail. Any suggestion?

TIA,
Roger