Question Number 165608 by naka3546 last updated on 05/Feb/22
$$\mathrm{Reupload}\:\:\mathrm{unanswered}\:\:\mathrm{question}. \\ $$$$\mathrm{sec}^{\mathrm{2}} \mathrm{1}°\:+\:\mathrm{sec}^{\mathrm{2}} \:\mathrm{2}°\:+\:\mathrm{sec}^{\mathrm{2}} \:\mathrm{3}°\:+\:\ldots+\:\mathrm{sec}^{\mathrm{2}} \:\mathrm{89}°\:\:=\:\:? \\ $$