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Jan 9, 2020 at 17:15 answer added fedja timeline score: 2
Jan 9, 2020 at 16:09 comment added Sean You are right, I meant $\sin$ instead of $\cos$.
Jan 9, 2020 at 16:09 history edited Sean CC BY-SA 4.0
mistake
Jan 6, 2020 at 17:52 comment added fedja As written, the maximizer is, obviously, $\eta\equiv 0$. Check the statement of the question; I strongly suspect that you meant something else.
Jan 6, 2020 at 3:26 history asked Sean CC BY-SA 4.0