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Latex how to write a fraction

Latex how to write a fraction: \frac

Latex fraction symbol a over b



Example: Latex limit with fraction

$\lim_{x \to a} \frac{f(x)-f(a)}{x-a}$

$$\lim_{x \to a} \frac{f(x)-f(a)}{x-a}$$

Example: Latex sum with fraction

$\sum_{n=0}^{\infty} \frac{1}{n^2+1}$

$$\sum_{n=0}^{\infty} \frac{1}{n^2+1}$$

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