Returns the arc cosine, or inverse cosine, of a given number. This operates in radians, just like FileMaker's other trigonometric functions. For the input to be a valid cosine, it should be in the range of -1 to 1.
Additional thanks to Corn Walker and Jason DeLooze.
Note: these functions are not guaranteed
or supported by BrianDunning.com. Please contact the individual
developer with any questions or problems.
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