Maths between dollars is inline: \(\sum_{k=1}^n k = \frac{n(n+1)}{2}\).
\(\sum_{k=1}^n k = \frac{n(n+1)}{2}\)
$\sum_{k=1}^n k = \frac{n(n+1)}{2}$
Maths between slash-square-brackets is display:
\[\sum_{k=1}^n k = \frac{n(n+1)}{2}\]
Maths between slash-square-brackets is display:
\[\sum_{k=1}^n k = \frac{n(n+1)}{2}\]
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