# System Functions

TAN( ) | Return Tangent

## Format

TAN(num[,ERR=stmtref])
Where:

num | Numeric expression whose Tangent will be returned.
stmtref | Program line number or statement label to which to transfer control.
#### Note: The value to be supplied must be in Radians, not Degrees. To convert Degrees to Radians: Radians = Degrees * pi / 180 Degrees = Radians * 180 / pi

## Returns

Numeric, rounded, Tangent of given number.

## Description

The TAN( ) function returns the Tangent of a given numeric expression. The numeric value returned will be rounded to the current PRECISION in effect. The inverse function is ATN( ) Return Arc-Tangent.

## Example

floating point
print tan(1)
.15574077246549E+01
print tan(-3.14159/2)
-.75369599539306E+06