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May 25 at 12:41 history edited Oth S CC BY-SA 4.0
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May 24 at 21:30 comment added Jean Marie Also of interest is the fact that this issue is a generalization of Alhazen problem which can be solved... using apollonian circles.
May 24 at 20:50 comment added Jean Marie I just found here a recent answer to a question which is (almost) exactly the same as the present one and the solution by Hwang is in the very same spirit as yours.
May 24 at 15:27 history edited Intelligenti pauca CC BY-SA 4.0
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May 24 at 14:59 history edited Oth S CC BY-SA 4.0
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May 24 at 14:49 history answered Oth S CC BY-SA 4.0