Another similar issues is this:
sage: x1,x2,t = var('x1,x2,t')
sage: ((1/(1-x2*x1^t)).taylor(x2,1,4).taylor(x1,1,4)).substitute(x2=1).
coefficient((x1 - 1))
0
sage: x1,x2,t = var('x1,x2,t')
sage: ((1/(1-x2*x1^t)).taylor(x2,1,4).taylor(x1,1,4)).substitute(x2=1)
-1/480*(t^8 - 10*t^6 + 9*t^4)*(x1 - 1)^4/t^5 + 1/720*(t^8 - 20*t^6 +
19*t^4)*(x1 - 1)^3/t^5 - 1/(t*(x1 - 1)) + 1/24*(t^6 - t^4)*(x1 - 1)^2/t^5 +
1/2*(t^4 - t^3)/t^4 - 1/12*(t^6 - t^4)*(x1 - 1)/t^5
As you can see, the latter clearly has a (x1 - 1) term, however when I try
to find it's coefficient in the code in the beginning, it returns 0. Am I
making a mistake here?
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