PHP acos() Function

PHP Math Reference : Return the arc cosine of different numbers

Definition and Usage

The acos() function returns the arc cosine of a number.

Tip: acos(-1) returns the value of Pi.

acos(number);

Parameter	Description
number	Required. Specifies a number in range -1 to 1

Return Value:	The arc cosine of a number. Returns NAN if number is not in the range -1 to 1
Return Type:	Float
PHP Version:	4+

❮ PHP Math Reference

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