KaTeX auto-render extension test!

The solution of $ax^2+bx+c=0$ is

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

Source code

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    <h1>KaTeX auto-render extension test!</h1>

    <p>The solution of $ax^2+bx+c=0$ is</p>

    <div>$$x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$$</div>
  </body>
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