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,

as in:

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)