No-clue question with a clickbait title on the HNQ: math.stackexchange.com/q/4670282/42969, also “almost duplicate” of several similar questions about integrals of rational functions of trigonometric functions.

[ SmokeDetector | MS ] Several emoji in title (89): Let A, B ⊆ R^n be closed convex sets containing the origin. Assume A+B is closed. Show that (A + B) ◦ = A ◦ ∩ B ◦ . Where X◦ means the polar of X.‭ by cy shawn‭ on math.SE

I suggest deletion of these PSQs: D1, D2, D3.

DV/del dupe of big FAQ on divisibilty via Binomial/Factor theorem, with high rep cherry picking