atan2

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
  1. double atan2(double y, double x)
    version(FreeBSD)
    extern (C)
    double
    atan2
    (
    double y
    ,
    double x
    )
  2. double atan2(double y, double x)

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