MAINSAIL Language Manual, Section 30.23

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30.23. aTan

Figure 30–22. aTan (GENERIC)
REAL
PROCEDURE   aTan        (REAL r);

LONG REAL
PROCEDURE   aTan        (LONG REAL r);

aTan returns the arctangent of its argument, which is in radians.

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MAINSAIL Language Manual, Section 30.23