KaTeX options
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fleqn
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{ "\\f": "#1f(#2)" }
before
after
\left( x \right) \left( x^2 \right) % comment \left( \frac{a}{b} \right) \left( \frac{a^2}{b} \right) \left( \dfrac{a}{b} \right) \left( \dfrac{a^2}{b} \right)