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Question: Problems with series expansion

Question:Problems with series expansion

vanzzy 35 Maple 18
assumptions series
July 31 2019
0

I am trying to expand a multivariable (more specifically 4 variables) function in powers of one of its variables when it goes to infinity.

However, the result I get is always zero, even if I input (or not) values for some of the other variables.

Can anybody help?

series_expansion.mw

P.s.: I want to do the same for the other two functions I defined in the worksheet as well.
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