# $ZCOT

## Synopsis

$ZCOT(n)

### Parameter

Argument | Description |
---|---|

n | An angle in radians. |

## Description

$ZCOT returns the trigonometric cotangent of n. The result is a signed decimal number.

## Parameter

### n

An angle in radians, specified as a nonzero value. It can be specified as a value, a variable, or an expression. A value of 0 generates an <ILLEGAL VALUE> error. A non-numeric string is evaluated as 0.

## Examples

The following example permits you to compute the cotangent of a number:

```
READ "Input a number: ",num
IF num=0 { WRITE !,"zero is an illegal value" }
ELSE {
WRITE !,"the cotangent is: ",$ZCOT(num)
}
QUIT
```

The following example compares the results from Caché fractional numbers ($DECIMAL numbers) and $DOUBLE numbers:

```
WRITE !,"the cotangent is: ",$ZCOT(1.0)
WRITE !,"the cotangent is: ",$ZCOT($DOUBLE(1.0))
WRITE !,"the cotangent is: ",$ZCOT(-1.0)
WRITE !,"the cotangent is: ",$ZCOT($DOUBLE(-1.0))
WRITE !,"the cotangent is: ",$ZCOT($ZPI/2)
WRITE !,"the cotangent is: ",$ZCOT($DOUBLE($ZPI)/2)
```

Note that the cotangent of pi/2 is a fractional number, not 0.