Php atan
From w3cyberlearnings
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PHP function atan
This function returns the arc tangent of X and X is the value of tangent radians.
Syntax atan
X is the tangent value
atan(X);
Example 1
<?php echo atan(9); echo "<br/>"; echo atan(-9); ?>
Output
1.460139105621 -1.460139105621
