[UNDELETED]
Request for undeletion, or explanation of deletion:
http://math.stackexchange.com/a/898051/https://math.stackexchange.com/a/898051/, a "hint" answer that does substantial work toward solving the differential equation in the question Differential equation $\sin \theta \frac{dr}{d \theta}+r\cos \theta =\tan \theta,0<\theta<\pi/2$Differential equation $\sin \theta \frac{dr}{d \theta}+r\cos \theta =\tan \theta,0<\theta<\pi/2$. The answer received comments that it should be a comment, but I disagree. Substantial contributions toward solving the problem are often fine as answers, even if they do not go through the full details of a write-up of a solution. (Comments included a nonsensical one selected from a review queue.) It might be relevant that the answer was posted before the other, more detailed ones.
A moderator deleted it, so regular users cannot vote to undelete. I'm requesting that a moderator undelete it, and would be interested in explanations of why people think such an answer should be deleted.