It has the following functions:
multiplicacion
division
sum
subtraction
Exponential function
root function
sine
cosine
tangent
syntax example:
tan 45 * 9 + 5 :
First meets the tangent of 45, then multiply the result by and finally adds 5.
tan ( 45 * 9 ) + 5 :
First, solve what is inside the parentheses, this result applies tangent and then adds 5.
For more see attached photos shows.