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Question:how to plot with DEplot and odeplot in the polar coordinate?
May 1, 2012 ... then plot the phase portrait, i use to method ,but all of them failed: ... and also get a wrong result, so how to plot the phase portrait in polar ...

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The phase portrait of ode system - MaplePrimes
Mar 9, 2020 ... How can I get the phase portrait and several trajectory of the following system(it is in polar coordinates ). r'=r(1 − r^2) + 2rcos(θ),. θ' = 1.

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