The ASIN function returns the arcsine (in radians) of a given Number.
ASIN(number) -> arcsine
- number (required, type: Number)
- Any number.
- arcsine (type: Number)
- The arcsine, in radians, of the given number.
The following example returns the arcsine of 1. Note that the arcsine of one is ninety degrees, or 0.5π radians, but the ASIN function doesn't output an angle in degrees or in radians in terms of pi. Rather, it provides a numerical estimation of the angle in radians:
ASIN(1) -> 1.5707963267948966
DEGREES(ASIN(1)) -> 90
ASIN can also be used in tandem with the PI function to provide insight into how the angle in radians relates to terms of pi, such as in the following example:
ASIN(1)/PI() -> 0.5