Complex.ACosReal (gb.gsl)
Static Function ACosReal ( X As Float ) As Complex
Returns the complex arccosine of the real number
X.
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For X between -1 and 1, the function returns a real value in the range [0,π].
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For X less than -1 the result has a real part of π and a negative imaginary part.
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For X greater than 1 the result is purely imaginary and positive.