aTan
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var = aTan(expr) 

Returns the arctangent of a number.

Parameters
 
expr  
 
Any expression.  

Remarks

Returns result in radians. The range of the result is -PI /2 to PI /2 radians. To convert angle from radians to degrees use radToDeg function. Use aTan2 function to obtain result in the range -PI to PI radians.