A growing list of functions that you can use in formulas and scripting...

abs (x) – absolute value

arccos (x) – inverse cosine

arcsin (x) – inverse sine

arctan (x) – inverse tangent

cos (x) – cosine

cosh (x) – hyperbolic cosine

exp (x) – exponentiation

index (string, part) – look up a substring, or 0 if not found

index (strings, s) – look up whether s occurs in strings

mul## (a##, b##) – matrix multiplication

readFile$ (filePath$) – read a whole text file into a string

readLinesFromFile$# (filePath$) – read all lines from a text file

sin (x) – sine

sinh (x) – hyperbolic sine

splitByWhitespace$# (string$) – split a string into inks

tan (x) – tangent

tanh (x) – hyperbolic tangent