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Question: ignoring coefficients of higher order terms

Question:ignoring coefficients of higher order terms

rahulscify 10 Maple
coefficients
November 29 2017
0

Hi,

I am collecting first order terms in psi and phi in the following expression.

Basically I want to keep coefficients for which (power of phi + power of psi) < 2 and ignore the rest.

Here, H, a, psi, phi are all functions, not variabels.

I tried following answer but it doesn't work due to derivatives.

https://www.mapleprimes.com/questions/37228-Ignore-Terms-Above-Particular-Orderpower

(Error, selecting function must return true or false)

Thanks a lot,

Rahul
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