acos

PHP 4, PHP 5, PHP 7, PHP 8
acos - Arc cosine
Acos Online Tool
Manual
Code Examples

acos( float$num ): float

Returns the arc cosine of num in radians. acos is the inverse function of cos, which means that a==cos(acos(a)) for every value of a that is within acos' range.

Parameters

num

The argument to process

Return Values

The arc cosine of num in radians.

Related Functions

  • acosh - Inverse hyperbolic cosine
  • asin - Arc sine
  • atan - Arc tangent
  • cos - Cosine

Example of acos

Show all examples for acos

<?php
echo acos(-100) . "\n";
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Edit/Test in Sandbox
PHP Version:


Function acos:

Mathematical Functions Functions

Most used PHP functions