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How do we get the integral sign below? enter image description here

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\documentclass{article}
\begin{document}

your picture: $\displaystyle\int_a^b f(x)dx=F(b)-F(a)$

arguably nicer: $\displaystyle\int\limits_a^b f(x)\,\mathrm{d}x=F(b)-F(a)$
\end{document}

enter image description here

  • What you have a standard integral sign from latex. This integral sign was used in the past and it is in Stewart's book. – mathsolver Dec 06 '17 at 05:33