markdown + mathjax **realtime** preview! ## Quadratic equation $$a x^2 + b x + c = 0 (a \neq 0) \Rightarrow x = \frac{-b \pm \sqrt{b^2 - 4 a c}}{2 a}$$ *Italic* **Strong** [Google](https://www.google.com) | AAA | BBB | CCC | | ---- | ---- | ---- | | apple | banana | chocolate | | 321 | 321 | 6416 |

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