I have an answer here: https://math.stackexchange.com/a/3477238/633100. It just got an unexpected downvote but no one ever left a comment on why the downvote was casted, a comment was there but was very vaguely stated. I see that lot of queries like these arise at Meta and wish to know why I got downvotes.

How can this answer be improved. Is it okay to leave Random downvotes like these without justification? What might be the reason for such downvote.

Thanks

• This question got a downvote without any note on how I can improve too Dec 15 '19 at 16:16
• While I'm not a downvoter on either this or your Answer on main, I can point out that there have been numerous discussions of "why I got downvotes" previously. It is important to do a reasonable job of research before asking (in either place). In particular it would have become apparent that voting, whether up or down, on the quality of posts is anonymous and therefore typically done "without justification". Dec 15 '19 at 19:33
• "I see that lot of queries like these arise at Meta" – and did they not raise exactly the question you are raising here? and did you expect to learn anything new by raising the question again? Dec 15 '19 at 20:21
• I have added the tag (specific-answer) as your question seem to be mainly about this one particular instance (see the tag info). Regarding your general question about downvotes without a comment, this has been discussed on meta several times. For example: Can a down/up votes be accompanied by a comment?, Downvoting for no stated reason is abusive, In praise of silence, ... Dec 16 '19 at 11:26
• Dec 16 '19 at 11:26

• The answer you gave uses a development of $$\tan(x)$$, at least initially without much comment, which is in a way stronger than what is asked in the question. Thus, the reasoning feels a bit circular. This is a general problem with these types of questions (not the answers), it is often not made clear what is used as the definition of the trigonometric function, what is known, etc. This can change drastically what is a reasonable answer.