ARC COSINE

The ARC function returns the arc cosine angle in radians. 

The ARC command has the following format:

ARC angle cos[cr]

angle is the register that will receive the angle in radians

cos   is the  register that will contains the cosine

Example:ARC ARCOS RATIO[cr]

A new angle will be placed in ARCOS each time the value of RATIO changes

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