Php acos

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PHP function acos

This function returns the arc cosine of a number, and it returns NULL when the input number is not in the range -1 to 1.

Syntax acos

  • X is a number in the range -1 to 1.
acos(X);

Example 1

<?php

echo acos(0);
echo "<br/>";
echo acos(-0.3);
?>

Output

1.5707963267949
1.8754889808103