Table of Contents

TAN

(Defined in TRIGONO.BAS)

The TAN() function returns the arctangent of the argument. The inverse function of TAN() is ATN.

Function header

DECLARE FUNCTION TAN AS FLOAT (x AS FLOAT) SHARED STATIC

Warning

You must include the TRIGONO.BAS library in your program to be able to access this function.

Example

INCLUDE "trigono.bas"
PRINT TAN(PI / 4) : REM outputs a number very close to 1, see below note

Note

Trigonometric functions in XC=BASIC were designed to be fast rather than accurate. The result is accurate to 3 to 4 decimal digits (the error range is 0 to 0.0006). Please see this article for details.

See also