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> Thanks, I'm in the same position as you, except that I'm in the position > where I need it use the result, and if it ever returns INF my function will > blow up. But it doesn't look like that can happen. > Doesn't atan2 relies on the C lib math floating point library? At least in CPython. I think (but not 100% sure) that it is implementation dependent, and returns what is returned by clib floating point lib. Since the meaning of atan2 is an angle, it should always be between [-pi,pi]. The only exception maybe when there is a NaN in the arguments. But I cannot think of any interpretation where atan2 would return Inf or -Inf.

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