tan
(PHP 3, PHP 4 )
tan -- Tangent
Description
float tan ( float arg)
tan() returns the tangent of the arg parameter. The arg
parameter is in radians.
Example 1. tan() example
<?php
echo tan(M_PI_2); // 1
?>
See also: atan(), sin(), cos(), and deg2rad().
tanh
(PHP 4 >= 4.1.0)
tanh -- Hyperbolic tangent
Description
float tanh ( float arg)
Returns the hyperbolic tangent of arg, defined as sinh(arg)/cosh(arg).
See also: tan(), atanh(), sin(), and cos().
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