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atan2 expects the Y parameter first.
See this SO question for answers as to why the Y parameter is passed in first.
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I'm sorry, but we can not answer this question for the general case, because interviewers are not all the same. People who make hiring decisions are all individuals who apply their own personal judgment systems and expect very different things. While one person might be impressed by the extra length you went to, another might wonder why you are wasting your ...
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