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

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

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Calculates one's complement

(PECL trader >= 0.2.0) Hammer array trader_cdlhammer

(PECL stats >= 1.0.0) Not documented float

(PECL trader >= 0.2.0) Vector Trigonometric Tan

(PECL stats >= 1.0.0) Computes the skewness of the data in the array

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

(PECL lapack >= 0.1.0) Calculate the inverse of a matrix

(PECL stats >= 1.0.0) Not documented float