Asin ( number )
Returns the arc sine of a given number.
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Function definition: (Copy & paste into FileMaker's Edit Custom Function window)
Returns the arc sine, or inverse sine, of a given number. This operates in radians, just like FileMaker's other trigonometric functions. For the input to be a valid sine, 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.