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

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

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

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Inverse hyperbolic tangent

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Calculate the length of the hypotenuse of a right-angle triangle

(PHP 4, PHP 5, PHP 7) Generate a better random value

(PHP 4, PHP 5, PHP 7) Calculates the exponent of e

(PHP 4, PHP 5, PHP 7) Combined linear congruential generator

(PHP 4, PHP 5, PHP 7) Binary to decimal number

(PHP 4, PHP 5, PHP 7) Absolute value number abs