# Fractions, roots, and binomial coefficients

```latex
\frac{a+b}{c+d}
```

```latex
\sqrt{x^2+y^2} \qquad \sqrt[3]{8}=2
```

```latex
\binom{n}{k}=\frac{n!}{k!(n-k)!}
```

```latex
\cfrac{1}{1+\cfrac{1}{1+\cfrac{1}{1+\ddots}}}
```