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## 4.4 Built-in functions

A built-in function is composed of an identifier followed by a pair of
parentheses containing an `expression-list` (the list of its
arguments)(6). Here is the list of the built-in functions currently
implemented:

`build-in-function`:

`Acos (`

`expression`)Arc cosine (inverse cosine) of an

`expression`in [-1,1]. Returns a value in [0,Pi].`Asin (`

`expression`)Arc sine (inverse sine) of an

`expression`in [-1,1]. Returns a value in [-Pi/2,Pi/2].`Atan (`

`expression`)Arc tangent (inverse tangent) of

`expression`. Returns a value in [-Pi/2,Pi/2].`Atan2 (`

`expression`,`expression`)Arc tangent (inverse tangent) of the first

`expression`divided by the second. Returns a value in [-Pi,Pi].`Ceil (`

`expression`)Rounds

`expression`up to the nearest integer.`Cos (`

`expression`)Cosine of

`expression`.`Cosh (`

`expression`)Hyperbolic cosine of

`expression`.`Exp (`

`expression`)Returns the value of e (the base of natural logarithms) raised to the power of

`expression`.`Fabs (`

`expression`)Absolute value of

`expression`.`Fmod (`

`expression`,`expression`)Remainder of the division of the first

`expression`by the second, with the sign of the first.`Floor (`

`expression`)Rounds

`expression`down to the nearest integer.`Hypot (`

`expression`,`expression`)Returns the square root of the sum of the square of its two arguments.

`Log (`

`expression`)Natural logarithm of

`expression`(`expression`> 0).`Log10 (`

`expression`)Base 10 logarithm of

`expression`(`expression`> 0).`Modulo (`

`expression`,`expression`)see

`Fmod(`

.`expression`,`expression`)`Rand (`

`expression`)Random number between zero and

`expression`.`Round (`

`expression`)Rounds

`expression`to the nearest integer.`Sqrt (`

`expression`)Square root of

`expression`(`expression`>= 0).`Sin (`

`expression`)Sine of

`expression`.`Sinh (`

`expression`)Hyperbolic sine of

`expression`.`Tan (`

`expression`)Tangent of

`expression`.`Tanh (`

`expression`)Hyperbolic tangent of

`expression`.

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