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## Volume of kiln

### Solution

Let \(x>0\)

\[\begin{aligned}
3-\cosh x =0 \\\\
\cosh x =3 \\\\
x= \ln (3+2 \sqrt{2})
\end{aligned}\]

\[v=2 v^{*}\]

\[\cong 29,5178 \ldots
\]

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Why does the number \(98\) disappear when writing the decimal expansion of \(\frac{1}{9801}\) ?