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Just to make sure I am on the same page as you, are you referring to the Operators/Functions found in the expression browser or something within the API? Most of the math type functions within the expression browser have their operations and parameters explained within the Description box. I am not quite sure what other options you are seeing. Could you give some examples of some of the Math functions you have questions about and the options that are not defined?
Regards,
James W. Applications Engineer National Instruments