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A Sin Function
Math Trig Complex Class

Public Function ASin( _
    ByVal vX As Variant _
    ) As Variant

"Inverse Sine" or "Arcsine"
Angle whose sine is X.
Inverse of the Sine function.

Examples: 
    ASin(-0.5) = -0.523598775598299
    ASin(0) = 0
    ASin(0.5) = 0.523598775598299
    ASin(1) = 1.5707963267949
    ASin(1.5) = "1.5707963267949|-0.962423650119205"
    ASin(2) = "1.5707963267949|-1.31695789692482"
    ASin("2.3|-4.5") = "0.464698842374882|-2.31904592228528"
See also: 
    Sine Function
    ACos Function
    ATan Function
    ASinH Function
    Arcsin Function
vX: Function returns the principal value of the angle whose sine (expressed in radians) is vX. Function returns Null if vX is Null or cannot be fixed up to a real or complex number (as defined by the ComplexStringToReals function). Complex numbers are represented within strings as "R|I" where R is the real part and I is the imaginary part.
Note: Microsoft named this function Arcsin within their Derived Math Function help topic.

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