# Function Reference

ASin

Calculates the arcsine of a number.

ASin ( expression )

Parameters

expression | Any value between -1 and 1 (inclusive).

Return Value

Returns the trigonometric arcsine of expression. Result is in radians.

Remarks

ASin(x) is mathematically defined only for -1 < x < 1, so ASin tends to return -1.#IND for other values of x.

Related

Sin, Cos, Tan, ACos, ATan

Example

$x = ASin(0.5)
$pi = 3.14159265358979
$radToDeg = 180 / $pi
$y = ASin(1) * $radToDeg ;arcsine of 1 returns 90°