Expression editor behavior descriptions and meanings

Can anyone tell me where I can find the descriptions and meanings for the expression editor behaviors in atrribute change behavior?
Such as: ABS, Acos, asin, atan, ceil, cos, exp, floor and all this stuff....
I do not know what they do/mean and what I can do with it.
Thanks!
Such as: ABS, Acos, asin, atan, ceil, cos, exp, floor and all this stuff....
I do not know what they do/mean and what I can do with it.
Thanks!
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