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 Dec 19 comment Having an input number, get a result in a specific range @satishramanathan I updated the question. I'm a developer, and there we have a random function. I don't want this to be random or depend on anything that changes (e.g. time). I want for a given $N$ and range to get the same result now and after one day and after one year. Dec 19 revised Having an input number, get a result in a specific range added 165 characters in body Dec 19 asked Having an input number, get a result in a specific range Aug 5 comment Rotate a point on a circle with known radius and position Accepted your answer since it is more detailed. Too bad that SE doesn't allow to accept multiple answers. :) Aug 5 accepted Rotate a point on a circle with known radius and position Aug 5 comment Rotate a point on a circle with known radius and position Nice! Upvoted you! Aug 5 comment Rotate a point on a circle with known radius and position This is also helpful, but I don't understand there the radius $r$ disappeared in the final solution. Isn't it supposed to be there as well? Aug 5 comment Rotate a point on a circle with known radius and position Ah, sounds good! Actually, it's multiplying two matrix. Thanks a lot! Aug 5 comment Rotate a point on a circle with known radius and position where A,B,C are the vectors representing their respective points. -- how to build these vectors? Also, how to multiply $M(B - A)$? Aug 5 comment Rotate a point on a circle with known radius and position @Shailesh I saw something on Wikipedia, but didn't really understood the things. I think I know what the origin change means. Aug 5 revised Rotate a point on a circle with known radius and position edited title Aug 5 asked Rotate a point on a circle with known radius and position Aug 4 comment Move a point with known angle on a circle Can you please add a general formula where I have as input the initial point ($x$ and $y$), the radius $R$ and the angle? Maybe it would be nice to have support for different circle centers. Is that possible? Aug 4 comment Move a point with known angle on a circle In this solution, where does the $R$ value appear in the formula? Aug 4 reviewed Approve Co - ordinates of a point lying on the perpendicular bisector of a segment. Aug 4 accepted Co - ordinates of a point lying on the perpendicular bisector of a segment. Aug 4 asked Co - ordinates of a point lying on the perpendicular bisector of a segment. Aug 4 awarded Talkative Jun 15 comment If $x ^ 6 = x$, prove that $x ^ 2 = x$, in a ring @BillDubuque That's also interesting. Thanks! (Y) Jun 15 revised If $x ^ 6 = x$, prove that $x ^ 2 = x$, in a ring edited body