I don't know where I've went wrong here. It pops up with "missing } inserted" and I'm not entirely sure what is wrong. It is happening after the "or" part of the code. When i have (x'(t))^2 by itself under the square root it works but when I add the y'(t) bit it doesn't. This is within a table btw.

\(\int_{x_1}^{x_2} {\sqrt{1+{(f'(x))}^2}}\,\mathrm{d}x\) or \(\int_{t_1}^{t_2} 
  • 2
    Insert a brace (}) after the last t.
    – TeXnician
    Commented Apr 10, 2017 at 11:55
  • My editor, Sublime Text, marks matching parentheses, which is helpful in these cases.
    – lblb
    Commented Apr 10, 2017 at 12:03

2 Answers 2


You're using too many braces and it's easy to forget one.




  \int_{x_1}^{x_2} \sqrt{1+(f'(x))^{2}}\diff x
  \int_{t_1}^{t_2} \sqrt{(x'(t))^{2}+(y'(t))^{2}}\diff t


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you have a extra grouping here {\sqrt{

  • 1
    This is already covered in the other answer (posted before yours).
    – Werner
    Commented Apr 11, 2017 at 5:25

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