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# NAME

math - 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.
 stdlib 3.3 Ericsson AB

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