Syntan uses the syntax which is not very different from what we are normally used to. Spaces are ignored and the case of characters doesn't matter.

Basic functions
sqr(…) square sqrt(…) square root
ln(…) natural logarithm exp(…) exponential function
int(…) integer part frac(…) fractional part
abs(…) absolute value ( |...| ) sgn(…) sign (-1, 0 or 1)
round(…) rounded value fact(…) factorial ( ! )
log(…) decimal logarithm gamma(...) Gamma function

Basic functions (continuing)

Parentheses

Operators

Priority of operations

Constants

Literals

Differentiations

External value