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Undid revision 665720634 by 176.42.198.246 (talk) revert test edit |
m →Method of multiple scales: Last equation: sign correction. |
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\frac{\partial^2 Y_0}{\partial t^2} + Y_0 &= 0,
\\
\frac{\partial^2 Y_1}{\partial t^2} + Y_1 &=
\end{align}
</math>
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