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If one uses \left( and \right) to set functions an extra space is created between the function name and the brackets. How does one correctly set functions?

\documentclass{article}

\begin{document}
  Compare $f(x)$ and $f\left(x\right)$.
\end{document}

Edit

Because of the duplicate tag that was not removed when I edited my question, I created a new question which has a useful answer here: How to correctly set functions with `\left(` and `\right)`?

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