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    4D v13.4
 ATAN 
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The ATAN function returns the arc tangent of the arithmetic_expression. It is the inverse of the tangent (TAN) function. The arithmetic_expression represents the angle expressed in radians.
This example will return the arc tangent of the angle expressed in radians (-0.73):
SELECT ATAN(-0.73)
FROM TABLES_OF_ANGLES;
	Product:  4D
	Theme:  Functions