====== COS ======

(Defined in //[[trigono.bas]]//)

The ''COS()'' function returns the cosine of the argument.

===== Function Header =====

  DECLARE FUNCTION COS AS FLOAT (arg AS FLOAT) SHARED STATIC
  
<adm warning>
You must include the //TRIGONO.BAS// library in your program to be able to access this function.
</adm>

===== Examples =====

  INCLUDE "trigono.bas"
  PRINT COS(0) : REM outputs .999403
  PRINT COS(0.785398) : REM outputs .707704

<adm 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 [[http://www.ganssle.com/approx.htm|this article]] for details.
</adm>

===== See also =====


  * [[TAN]]
  * [[ATN]]
  * [[SIN]]