# Reference/asin

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Revision as of 04:57, 20 September 2009 by Chris Burke (Talk | contribs)

## Contents |

## asin (arc sine function)

The `asin` function computes the arc sine of its argument; that is the value whose sine is the given argument. The result is in radians and lies between -PI/2 and PI/2 (the range is approximate due to rounding errors).

Null is returned if the argument is not between -1 and 1.

## Syntax

q)a:asin 0.5

## Example

q)asin 0.8 0.9272952

## See also

For a complete list of functions, see the kdb+ Function Reference.