Number value which is an angle specified in number of radians
Atn returns a Number specifying the arctangent of the given Number argument. In other words, it returns the angle whose tangent is the given Number argument.
The following example is applicable to both Basic and Crystal syntax:
Returns an angle of 0.7854 radians (rounded to 4 radians). To convert this angle to degrees, multiply by 180 / crPi. For instance, Atn (1) * 180 / crPi is 45 degrees.
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