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The physics package defines commands such as \grad, \div and \curl so that any subsequent delimiters are automatically resized (see MWE below). However, they also use a bold nabla. I would like to redefine the commands such that the automatic resizing is preserved but using a regular nabla. Is there any way this is possible?

\documentclass{article}
\usepackage{physics}

\begin{document}

\[ \nabla(\frac{a}{b}) \]
\[ \grad(\frac{a}{b}) \]

\end{document}

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\documentclass{article}
\usepackage{physics}
\DeclareDocumentCommand\vnabla{}{\nabla}
\begin{document}

\[ \nabla(\frac{a}{b}) \]
\[ \grad(\frac{a}{b}) \]

\end{document}

enter image description here

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