> For the complete documentation index, see [llms.txt](https://zaidlang.gitbook.io/z/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://zaidlang.gitbook.io/z/standard-library/math.md).
# Math
Provides basic constants and mathematical functions.
### Methods
#### `math.abs()`
Returns the absolute, or non-negative value, of a given value.
```go
math.abs(-100)
// expected value: 100
```
#### `math.cos()`
Returns the cosine of the radian argument.
```go
math.cos(math.pi / 2).round()
// expected value: 0
```
#### `math.isNegative()`
Determines if the specified value is negative.
```go
math.isNegative(-100)
// expected value: true
```
#### `math.isPositive()`
Determines if the specified value is positive.
```go
math.isPositive(100)
// expected value: true
```
#### `math.isZero()`
Determines if the specified value is zero.
```go
math.isZero(5)
// expected value: false
```
#### `math.sin()`
Returns the sine of the radian argument.
```go
math.sin(math.pi).round()
// expected value: 0
```
#### `math.tan()`
Returns the tangent of the radian argument.
```go
math.tan(0).round()
// expected value: 0
```
### Properties
#### `math.pi`
The mathematical constant π = 3.141592…, use the `round()` method to round down to the desired precision.
```go
math.pi.round(2)
// expected value: 3.14
```
#### `math.e`
The mathematical constant e = 2.718281…, use the `round()` method to round down to the desired precision.
```go
math.e.round(2)
// expected value: 2.72
```
#### `math.epsilon`
The mathematical constant 𝜀 = 2.220446049250e-16, represents the smallest value that a float can have different from zero.
```go
math.epsilon
// expected value: 0.00000000000000022204460492503130808472633361816
```
#### `math.tau`
The mathematical constant τ = 6.283185…, use the `round()` method to round down to the desired precision.
```go
math.tau.round(2)
// expected value: 6.28
```