174 ACS arc-cosine Purpose To calculate an angle whose cosine is known. The calculated angle is in radians but may be converted to degrees by using the function DEG . See DEG for more information. Examples 10 X=ACS(Y) 1205 angle=DEG(ACS(0.5678)) 330 OUT=ACS(.234) PRINT ACS (0.5) Description A function giving the arc-cosine of its argument. The result is in radian measure. Syntax = ACS ( ) Associated keywords ASN , ATN , SIN , COS , TAN , RAD, DEG