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.

Related

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")