Function Reference

ACos

Calculates the arcCosine of a number.

ACos ( expression )

Parameters

expression Any value between -1 and 1 inclusive.

Return Value

Returns the trigonometric arccosine of the number. Result is in radians.

Remarks

ACos(x) is mathematically defined only for -1 < x < 1, so ACos() tends to return -1.#IND for other values of x.

ASin, ATan, Cos, Sin, Tan

Example

Example 1

#include <MsgBoxConstants.au3>
Example()
Func  Example()
; Assign a Local variable the arcCosine of 0.5.
Local $fArcCos1= ACos (0.5)
; Display the result.
MsgBox ($MB_SYSTEMMODAL,"",$fArcCos1&" rad.")
; Assign a Local constant variable the approximate PI number.
Local Const $PI= 3.141592653589793
; Assign a Local variable the formula to switch from radian to degree (equals to one radian in degree).
Local $fRadToDeg= 180/ $PI
; Assign a Local variable a number in degree.
Local $fArcCos2= $fRadToDeg* ACos (-1)
; Display the result.
MsgBox ($MB_SYSTEMMODAL,"",$fArcCos2&" deg.")
EndFunc ;==>Example

Example 2

; Example of using ACos with degrees.
#include <Math.au3>
#include <MsgBoxConstants.au3>
Local $fDegree= _Degree (ACos (-1))
MsgBox ($MB_SYSTEMMODAL,Default ,"ACos(-1) = "&$fDegree&" degrees")