# Built in Functions¶

**Table of contents**- Built in Functions

There are a number of built-in functions, that usually just map with the corresponding `java.util.Math`

methods (so all of the same restrictions apply), this functions are:

## Trigonometric Functions:¶

`sin(x)`

: Sine of an angle expressed in radians`cos(x)`

: Cosine of an angle expressed in radians`tan(x)`

: Tangent of an angle expressed in radians

## Inverse Trigonometric:¶

`asin(x)`

: Arc sine in the range [-π/2, π/2)`acos(x)`

: Arc cosine in the range [0, π)`atan(x)`

: Arc tangent in the range [-π/2, π/2)

## Hyperbolic Functions:¶

`sinh(x)`

: Hyperbolic sine`(e^x - e^(-x)) / 2`

`cosh(x)`

: Hyperbolic cosine`(e^x + e^(-x)) / 2`

`tanh(x)`

: Hyperbolic tangent`(e^x - e^(-x)) / (e^x + e^(-x))`

## Logarithms¶

`log(x)`

: Base 10 logarithm of`x`

`log1p(x)`

: Base 10 logarithm of`(x + 1)`

`log10(x)`

: Base 10 logarithm of`x`

`log2(x)`

: Base 2 logarithm of`x`

## Misc¶

`pow(b, e)`

:`b`

to the power of`e`

`sqrt(x)`

: Square root of`x`

`cbrt(x)`

: Cube root of`x`

`exp(x)`

:`e`

to the power of`x`

`expm1(x)`

:`e`

to the power of`x`

minus 1 (`e^x - 1`

)`signum(x)`

:Note Signum of`x`

(`-1, 0, 1`

for`< 0`

,`= 0`

and`> 0`

respectively)`abs(x)`

: Absolute value of`x`

`ceil(x)`

: First integer closest to negative infinity greater than or equal`x`

`floor(x)`

: First integer closest to positive infinity less than or equal`x`

## Constants¶

`pi()`

: Ratio of the circumference of a circle to its diameter`3.14159265358979323846`

`e()`

: Base of the natural logarithm`2.7182818284590452354`

## Disabling built-in functions¶

Since version `0.6-riddler`

(28c731ea) you can disable all built-in functions like this:

```
Expression e = new ExpressionBuilder("x + 3")
.disableBuiltInFunctions() //<--
.variable("x")
.build();
```

Remember that since constants are also defined as functions this will also disable them.

## Code¶

The code for the functions is here.

Updated by Federico Vera almost 2 years ago · 10 revisions

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