Here are two nested toggles.
\sin(x) = x + \toggle {\cdots}
{\frac{x^3}{3!} + \frac{x^5}{5!} +
\toggle{\cdots}{\frac{x^7}{7!} + \cdots}
{Expand further}{Click to shrink}
}
{Click to expand}{Click to shrink}
More information on these commands may be found in
Sec. 9.5
of the WebTeX documentation.
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