LaTeX indicates a delimiter error for the following written code. Please help me if possible.

    \frac{1}{\sqrt{1-t^{2}}}\exp \biggl⁡[(z^{2}+z'^{2})+\frac{2zz't- 

1 Answer 1


There is a (invisible) Unicode codepoint U+2061 (FUNCTION APPLICATION) between \biggl and [. Remove \biggl[ and rewrite it.

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