Function Precedence

A <function_call> has a lower precedence than an <operand>, but it has a higher precedence than all the math, comparison, and logical operations. This means you have to be careful about correctly parenthesizing function arguments.

FOR EXAMPLE, 

sin x + 1

is evaluated as:

 
(sin x) + 1

In general, you have to put arguments that are expressions inside parentheses,

 
sin (x + 1)
atan2 (y - 1) (z - 1)

This rule has one exception, the unary minus. It is recognized as one type of <operand> you don’t have to parenthesize.

FOR EXAMPLE, 

sin -x

is interpreted as:

 
sin (-x)
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