MAINSAIL Language Manual, Section 30.4

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30.4. aCos

Figure 30–4. aCos (GENERIC)
REAL
PROCEDURE   aCos        (REAL r);

LONG REAL
PROCEDURE   aCos        (LONG REAL r);

aCos returns the arccosine of its argument, which is in radians.

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MAINSAIL Language Manual, Section 30.4