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This question already has an answer here:

Recently I stumbled on the following questions:

1. Proof that a trigonometric function of a rational angle must be non-transcendental

2. Is a trigonometric function applied to a rational multiple of $π$ always algebraic?

They are 100% duplicates but surprisingly they weren't marked as a duplicate of each other. I find it especially strange that the first one got a huge amount of views, yet no one mentioned that it was a duplicate of the other (older) question.

Should it be left like that or should something be done?

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marked as duplicate by mrf, Bill Dubuque, JonMark Perry, Surb, Watson Feb 21 '17 at 16:36

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    $\begingroup$ I like the idea of marking the one with the least excellent best answer as duplicate of the other (regardless of the order of posting). If they're close enough, merging may be a possibility, but that can have problems (like causing unintended duplicate answers in the same thread). $\endgroup$ – Jonas Meyer Feb 8 '17 at 20:41
  • $\begingroup$ At least they should be linked, and now they are because I posted the URL of the older one in a comment on the newer one. $\endgroup$ – Jonas Meyer Feb 8 '17 at 20:52
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    $\begingroup$ Why does almost every single MetaMSE question I look at have exactly one downvote? And why does this have any downvotes at all? $\endgroup$ – tilper Feb 16 '17 at 19:05
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There are so many questions; plenty of things just fall through the cracks.

When you come across clear-cut old duplicates flag/vote one of them as such. (Click "flag" select "a duplicate" etc.)

Which one you flag is in a way up to you. Generally, one will want to give most visibility to the subjectively best thread, so flag the other one.

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  • $\begingroup$ Better not to use flags, since that minimizes the number of community members involved in the duplicity decision. $\endgroup$ – Bill Dubuque Feb 20 '17 at 23:34
  • $\begingroup$ Are you also against casting a (simple) vote to close as duplicate? $\endgroup$ – quid Feb 21 '17 at 0:11
  • $\begingroup$ Are you against staying on topic? $\endgroup$ – Bill Dubuque Feb 21 '17 at 0:13
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    $\begingroup$ I ask for clarification regarding the scope of your concern. It is beyond me why you would not provide this information, and even more how such a request could be off-topic. $\endgroup$ – quid Feb 21 '17 at 0:54
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    $\begingroup$ @BillDubuque My understanding is that when a user with less than 3k flags as a duplicate, the post enters close review queue. The same happens for a duplicate close vote. (The difference is that it already has one close vote.) For 3k+ users there is actually no difference between the duplicate close vote and corresponding flag. See meta.math.stackexchange.com/q/23592 and meta.math.stackexchange.com/q/21547 So unless I am missing something, there is no substantial difference between the two possibilities. $\endgroup$ – Martin Sleziak Feb 21 '17 at 5:26
  • $\begingroup$ @Martin It is not too infrequent that certain users flag to get moderators to to attempt to unilaterally reverse decisions that they disagree with (e.g. reversing reopens). That is one of the cases that I had in mind. $\endgroup$ – Bill Dubuque Feb 21 '17 at 13:57
  • $\begingroup$ @BillDubuque what flag do they use to this end? "a duplicate" I don't think so. Hence it is completely unrelated to my suggested course of action. Can you stay on-topic? $\endgroup$ – quid Feb 21 '17 at 18:08
  • $\begingroup$ @quid I don't know (the mod simply said it was flagged as a duplicate in the cases I asked about). But my point should be clear: try to choose a method that will result in the most fair (and accurate) community decision on the matter. Even better, try to ensure it gets exposure to users that have the most experience and knowledge on such matters, so that the most informed decisions can be made (vs. robo-votes). $\endgroup$ – Bill Dubuque Feb 21 '17 at 18:17
  • $\begingroup$ @BillDubuque no your point is not clear at all since you refuse to state if you consider a vote to close as duplicate as an appropriate method or not. $\endgroup$ – quid Feb 21 '17 at 18:20
  • $\begingroup$ @quid That has nothing to do with the points I mention. $\endgroup$ – Bill Dubuque Feb 21 '17 at 18:21
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I would venture to say that "do nothing" might be a good option, especially in this case where both questions have reasonable answers. Putting a link to the other question in a comment for each would be a friendly way to make access to both questions' answers easier.

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