This sentence uses `$` delimiters to show math inline:  $\sqrt{3x-1}+(1+x)^2$

This is the same math expression expressed as a block element:
$$\sqrt{3x-1}+(1+x)^2$$

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With square brackets (inline): $[0, 2\pi]$

With square brackets (block):
$$[0, 2\pi]$$