Emmanuel Roque

Dear Devin Greene, In case you are interested, our package pdefourier solves this problem and many other potential problems when the input contains trigonometric expressions or a product of a polynomial and a trigonometric expression https://github.com/emmanuelroque/pdefourier I hope you find it helpful. There is also an arxiv preprint where we explain why even Mathematica has many issues regarding Fourier series. https://arxiv.org/abs/2004.02604 Best, Emmanuel Sent from Proton Mail for Android....

Problem with ic2 and bc2 from ode2

expand stops working after loading abs_integrate