BC 1000r

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.