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A Cos Function
Math Trig Complex Class

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

"Inverse Cosine" or "Arccosine"
Angle whose cosine is X.
Inverse of the Cosine function.

Examples: 
    ACos(-0.5) = 2.0943951023932
    ACos(0) = 1.5707963267949
    ACos(0.5) = 1.0471975511966
    ACos(1) = -3.5527136788005E-15
    ACos(1.5) = "-3.5527136788005E-15|0.962423650119205"
    ACos("2.3|-4.5") = "1.10609748442001|2.31904592228528"
See also: 
    Cosine Function
    ASin Function
    ATan Function
    ACsc Function
    ACosH Function
    Arccos Function
vX: Function returns the principal value of the angle whose cosine (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 Arccos within their Derived Math Function help topic.

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