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### Roots of quadratic equations

When $a \ne 0$, there are two solutions to \(ax^2 + bx + c = 0\) and they are

$$x = {-b \pm \sqrt{b^2-4ac} \over 2a}$$

### Fourier transform

$$f(x) = \int_{-\infty}^\infty F(k)e^{2\pi i k x}dk$$

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- Apple
- Banana

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Fruits | Vegetables |
---|---|

Apple | Broccoli |

Banana | Squash |