The ASIN function returns the arcsine (in radians) of a given number.

This function takes a single Number as input. It outputs another Number: the arcsine, in radians, of the given number.

### Declaration

``````ASIN(number) -> arcsine
``````

### Parameters

number (required, type: `Number`)
Any number.

### Return Values

arcsine (type: `Number`)
The arcsine, in radians, of the given number.

### Examples

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
``````

To calculate the arctangent in degrees, the ASIN function must be used in tandem with the DEGREES function, such as in the following example:

``````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
``````