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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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