$\frac{a}{b}$ will render the expression inline, which can be quite small, especially for fractions. To render larger expressions, use the block format

$$

\frac{a}{b}

$$

More examples can be found here:

$\frac{a}{b}$ will render the expression inline, which can be quite small, especially for fractions. To render larger expressions, use the block format

$$

\frac{a}{b}

$$

More examples can be found here:

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