# Built-in functions

In mathematical expressions, you can use the functions available for any platform.

| Function          | Description                                                                                                                     |
| ----------------- | ------------------------------------------------------------------------------------------------------------------------------- |
| **time()**        | Returns the time in milliseconds since the program started.                                                                     |
| **sin(angle)**    | The sine of the angle, where "angle" is the angle in degrees.                                                                   |
| **cos(angle)**    | The cosine of the angle, where "angle" is the angle in degrees.                                                                 |
| **ln(a)**         | The logarithm, where "a" is a number.                                                                                           |
| **exp(a)**        | Exponent ("e" in the degree of argument "a").                                                                                   |
| **asin(a)**       | Arcsine, where "a" is a number.                                                                                                 |
| **acos(a)**       | Arccosine, where "a" is a number.                                                                                               |
| **atan(a)**       | Arctangent, where "a" is a number.                                                                                              |
| **atan2(a1, a2)** | The arctangent of a1 / a2 with division check by 0.                                                                             |
| **sgn(a)**        | Sign. Returns 1 if the argument “a” is positive, -1 if it is negative, and 0 if the argument is zero.                           |
| **sqrt(a)**       | The square root of the argument "a". If the argument is negative, the variable will be assigned the value “NaN” (Not A Number). |
| **abs(a)**        | The absolute value of number "a".                                                                                               |
| **ceil(a)**       | Rounds up the passed argument "a" to the nearest integer.                                                                       |
| **floor(a)**      | Rounds down the passed argument "a" to the nearest integer.                                                                     |
| **random(a)**     | A random number between 0 and the passed argument “a”.                                                                          |