I have a differential equation: $$\ddot{\omega}+2k\dot{\omega}+2k^2{\omega}-2{\omega}^3=0$$ As I understand it's a Duffing equation, but I can't find the first integral. How can I do it? I didn't find any articles. Thanks for the help! $k$ - constant.
2026-04-01 11:12:49.1775041969
first integral of Duffing equation
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