 math(3) Mathematical functions.

## DESCRIPTION

This module provides an interface to a number of mathematical functions.

Note: Not all functions are provided on all platforms. In particular, the erf/1 and erfc/1 functions are not provided on Windows.

## EXPORTS

```
acos(X) -> float()

```

```
acosh(X) -> float()

```

```
asin(X) -> float()

```

```
asinh(X) -> float()

```

```
atan(X) -> float()

```

```
atan2(Y, X) -> float()

```

```
atanh(X) -> float()

```

```
cos(X) -> float()

```

```
cosh(X) -> float()

```

```
exp(X) -> float()

```

```
log(X) -> float()

```

```
log10(X) -> float()

```

```
log2(X) -> float()

```

```
pow(X, Y) -> float()

```

```
sin(X) -> float()

```

```
sinh(X) -> float()

```

```
sqrt(X) -> float()

```

```
tan(X) -> float()

```

```
tanh(X) -> float()

```

Types:

Y = X = number()

A collection of mathematical functions that return floats. Arguments are numbers.

```
erf(X) -> float()

```

Types:

X = number()

Returns the error function of X, where:

```erf(X) = 2/sqrt(pi)*integral from 0 to X of exp(-t*t) dt.
```

```
erfc(X) -> float()

```

Types:

X = number()

erfc(X) returns 1.0 - erf(X), computed by methods that avoid cancellation for large X.

```
pi() -> float()

```

A useful number.

## LIMITATIONS

As these are the C library, the same limitations apply.