Function Reference


Calculates the tangent of a number.

Tan ( expression )


expression Value in radians.

Return Value

Returns the trigonometric tangent of the number.


1° = pi / 180 radians.
Note that Tan() is "infinite" for ... -3PI/2, -PI/2, PI/2, 3PI/2, 5PI/2, ... and tends to return 1.63317787283838e+016 for such multiples of Pi-halves.


ACos, ASin, ATan, Cos, Sin


#include <MsgBoxConstants.au3>


Func Example()
    ; Assign a Local constant variable the approximate PI number.
    Local Const $PI = 3.141592653589793

    ; Assign a Local variable the tangent of PI / 4.
    Local $fTan1 = Tan($PI / 4)

    ; Display the result.
    MsgBox($MB_SYSTEMMODAL, "", $fTan1)

    ; Assign a Local variable the formula to switch from radian to degree (equals to one degree in radian).
    Local $iDegToRad = $PI / 180

    ; Assign a Local variable the tangent of 90 degrees (firstly converted to radians).
    Local $fTan2 = Tan(90 * $iDegToRad)

    ; Display the result.
    MsgBox($MB_SYSTEMMODAL, "", $fTan2)
EndFunc   ;==>Example