Atn
Returns the arctangent of a number
Syntax
`
Declare Function Atn ( ByVal number As Double ) As Double
`
Usage
`
result = Atn( number )
`
Parameters
`number`
A number.
Return Value
The angle, in radians, whose tangent is `number`, in the range [-Pi/2..Pi/2].
Description
`Atn` returns the arctangent of the argument `number` as a `Double` within the range of -Pi/2 to Pi/2. The arctangent is the inverse of the `Tan` function. The returned angle is measured in radians (not degrees).
Example
`
Print "Pi ="; Atn ( 1.0 ) * 4
Print Atn ( 4 / 5 )
`
The output would be:

    Pi = 3.141592653589793
    0.6747409422235527

Differences from QB

- None

See also

- `Tan`
- `Atan2`
- A Brief Introduction To Trigonometry