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Use dedicated fraction commands for clarity and consistency.

Core Commands

fractions.tex
\frac{a}{b}
\dfrac{a+b}{c+d}
\tfrac{1}{2}
\binom{n}{k}
\dbinom{n}{k}

Continued Fractions

cfrac.tex
\usepackage{amsmath}

\[
x = a_0 + \cfrac{1}{a_1 + \cfrac{1}{a_2 + \cfrac{1}{a_3}}}
\]