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Arccos Function
Math Trig Derived Class

Public Function Arccos( _
    ByRef X As Variant _
    ) As Variant

"Inverse Cosine"

Summary: This function is for users who have Visual Basic code that is based upon Microsoft's definition of this function in their "Derived Math Functions" Help Topic. This function is limited to arguments and results that are real numbers.
See also: 
    ACos Function
    Derived Math Functions Help (Visual Basic)
Definition: 
    Arccos(X) = Atn(-X / Sqr(-X * X + 1)) + 2 * Atn(1)

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