Liberty BASIC Help Online

ACS( n )
This function returns the arc cosine of the number or numeric expression n.  The return value is expressed in radians.
print "The arc cosine of 0.2 is "; acs(0.2)
There are 2 * pi radians in a full circle of 360 degrees.  A formula to convert degrees to radians is:  radians = degrees divided by 57.29577951
Note:  See also COS( )

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