(PHP 4 >= 4.1.0, PHP 5, PHP 7) Returns log(1 + number), computed in a way that is accurate even when the

(PHP 4, PHP 5, PHP 7) Arc sine float asin ( float

(PHP 4, PHP 5, PHP 7) Find lowest value mixed

(PHP 4, PHP 5, PHP 7) Converts the number in degrees to the radian equivalent

(PHP 4, PHP 5, PHP 7) Arc cosine float acos (

(PHP 4, PHP 5, PHP 7) Seed the better random number generator

(PHP 4, PHP 5, PHP 7) Decimal to hexadecimal

(PHP 4, PHP 5, PHP 7) Tangent float tan ( float

(PHP 4, PHP 5, PHP 7) Cosine float cos ( float

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Hyperbolic cosine