atan2f

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
  1. float atan2f(float y, float x)
    version(FreeBSD)
    extern (C)
    float
    atan2f
    (
    float y
    ,
    float x
    )
  2. float atan2f(float y, float x)

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