[Tex/LaTex] Integral sign in LaTeX beamer

Question

I am new to TeX Stackexchange and I do have a question. I hope that you can help me.

I am working with a beamer presentation and I prepare my TikZ pictures in a separate document (article class). I do get an integral sign via \iint like the following:

In my preparation document I get this by using the same code:

As you can see, the integral sign is not upright. The preparation document and the presentation use the same packages. Does anyone know how to fix this?

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EDIT:

Here is a MWE:

\documentclass[ngerman, trans]{beamer}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{amsmath,tikz,pgf,amssymb,graphicx,commath,pifont,fancybox,setspace,multicol,mathtools,pgfplots}
\usepackage{sfmath}
\usepackage{esint}
\usepackage{verbatim}
\usepackage[absolute, overlay]{textpos}
\usepackage{fancyvrb,xcolor,tabularx,fontawesome,empheq,epstopdf,circuitikz,mdframed}
\usetikzlibrary{arrows,calc}

\begin{document}
\begin{frame}
$$\iint_A \vec{v}\circ\dif\vec{A}$$
\end{frame}
\end{document}

Thanks to the answer of Henri Menke, he brought me to the idea to do something with the wasysym package. By using the wasysym package in this configuration, I got something like 'option clash'. By deleting wasysym, it works with no upright integral signs.

Answer 1

Use the wasysym package (as you do in your document).

\documentclass{beamer}
\usepackage{wasysym}
\begin{document}

\begin{frame}
  \[ \iint \vec{v} \circ \mathsf{d}\vec{A} \]
\end{frame}

\end{document}