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The LaTeX command for dfrac (⁄) is \dfrac{a}{b} — display-style fraction.
\dfrac{a}{b}Write \dfrac{a}{b} inside math mode — that is, between $…$ for inline math or in a \[ … \] / equation block for display math. This symbol needs the amsmath package, so add \usepackage{amsmath} to your preamble.
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Use \dfrac{a}{b} in math mode after adding \usepackage{amsmath} to your preamble. For example, $\dfrac{a}{b} f(x)$.
It comes from the amsmath package — add \usepackage{amsmath} to your preamble.