cv-pls trigonometry Unclear (also, probably a duplicate, but the question is poor enough that I didn't spend too much time looking for a dupe target.) Reference for the trig identities $\cos\phi= \frac{1}{\sqrt{1+\tan^2\phi}}$ and $\sin\phi=\frac{\tan\phi}{\sqrt{1+\tan^2\phi}}$?‭ - aows61‭ 2019-08-23 02:11:45Z

@MartinSleziak I have flagged for merging.

[ SmokeDetector | MS ] Few unique characters in body, no whitespace in body, no whitespace in title, repeating characters in body, repeating characters in title (386): XXXXXXXXXXXXXXXXXXXXXXX ✏️ by Xxx Ddd on math.SE

D9 should be kept for reference; it's actually a useful result

why delete D3?

Another ex-HNQ for closure

cv-pls number-theory Unclear, but already has FGITW answers. Working out the negative power of a number‭ - Jakub Kopaposkuz‭ 2019-08-23 22:26:13Z