# ACS

## Syntax

```
ACS(numericExpression)
```


## Description

Returns the arc cosine value of the given argument.
Argument must be a numeric expression. Returned value type is [float](types.md#Float).

## Examples

```
REM Arc cosine value
PRINT "Arc Cosine value of a is "; ACS(a)
```


## Remarks

* This function is 100% Sinclair BASIC Compatible
* If the given argument type is not float, it will be [converted](cast.md) to float before operating with it.

##See also

* [SIN](sin.md) and [ASN](asn.md)
* [TAN](tan.md) and [ATN](atn.md)
* [COS](cos.md)
