WorksheetFunction.Asin (Excel)

Returns the arcsine, or inverse sine, of a number. The arcsine is the angle whose sine is Arg1. The returned angle is given in radians in the range -pi/2 to pi/2.

To express the arcsine in degrees, multiply the result by 180/PI( ) or use the Degrees method.

Asin (Arg1)

Arg1: The sine of the angle that you want; must be from -1 to 1.

Dim dblArg1 As Double: dblArg1 = 
Dim dblAsin As Double
dblAsin = WorksheetFunction.Asin(Arg1:=dblArg1)