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Math\[ u = \int_0^w f(a,u) dt \]

Ugly stuff: <math display=inline>a \implies b</math>

Displayed equation:

\( \begin{align} x &= 1 \\ y &= 2 \end{align} \)

AMS Math: <amsmath> u = \int_0^h f(a,u) dt </amsmath>

Interwiki link: FBS wiki