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Trigonometrijske funkcije koje vraćaju arctangens brojčane vrijednosti. Vrijednost vraćanja je u rangu od -Pi/2 do +Pi/2.

The arctangent is the inverse of the tangent function. The Atn Function returns the angle "Alpha", expressed in radians, using the tangent of this angle. The function can also return the angle "Alpha" by comparing the ratio of the length of the side that is opposite of the angle to the length of the side that is adjacent to the angle in a right-angled triangle.

Atn(side opposite the angle/side adjacent to angle)= Alpha

```
Atn (Number As Double) As Double
```

Double

Number: Any numerical expression that represents the ratio of two sides of a right triangle. The Atn function returns the corresponding angle in radians (arctangent).

Da biste pretvorili radijane u stupnjeve, pomnožite radijane sa 180/pi

degree=(radian*180)/pi

radian=(degree*pi)/180

Pi is here the fixed circle constant with the rounded value 3.14159. Pi is a Basic mathematical constant.

```
REM sljedeći primjer izračunava sa desnim kutom trokuta.
REM kut Alpha od tangente kuta Alpha:
Sub ExampleAtn
REM oko Pi = 3.14159 je predefinirana konstanta
Dim d1 As Double
Dim d2 As Double
d1 = InputBox("Enter the length of the side adjacent to the angle: ","Adjacent")
d2 = InputBox("Enter the length of the side opposite the angle: ","Opposite")
Print "The Alpha angle is"; (atn (d2/d1) * 180 / Pi); " degrees"
End Sub
```