Hello wxuyec,
> The same expression, How can I want to get
>
> the coefficient of x^4*y?
>
The coefficient of the coefficient...
try
var('a b x y')
res = expand ((a+b+x+y+1)^6)
res.coefficient (x^4)
res.coefficient (y)
res.coefficient (x^4).coefficient(y)
res.coefficient (y).coefficient(x^4)
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