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並前往https://tex.stackexchange.com/questions/84469/unicode-degree-symbol-in-math-formulas-textdegree-invalid-in-math-mode

Unicode degree symbol ° in math formulas: \textdegree invalid ...

... \usepackage{gensymb} \begin{document} Degree symbol in plain text works: 90° is a right angle. Degree in math now work: $\cos(90\degree) = 0$.

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