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ATN()
Abbreviation: A <SHIFT+T>
TYPE: Function-Numeric
FORMAT: ATN(<number>)
Action: This mathematical function returns the arc tangent of
the number. The result is the angle (in radians) whose tangent
is the number given. The result is always in the range -pi/2 to
+pi/2.
EXAMPLES of ATN Function:
10 PRINT ATN(0)
20 X = ATN(J)*180/ {pi} : REM CONVERT TO DEGREES
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