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.
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FOR EXAMPLE, |
sin x + 1 |
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is evaluated as: |
(sin x) + 1 |
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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.
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FOR EXAMPLE, |
sin -x |
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is interpreted as: |
sin (-x) |