If it expects a ")" then it sounds as though you are providing more arguments than it expects. Or different types of arguments than it expects.
Does it expect for one of them to be an integer, and another floating point type? Does it expect one to be a number rather than a variable? A string? Etc.
Did you designate for the function to manipulate a variable's value only within the function, or is it set to change the variable in its memory-address at some point?