Question: how open the series with unkown variable and take derivative one and two ...?

restart

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B := (sum(a__n*exp(n*x), n = -c .. p))/(sum(b__m*exp(m*x), m = -d .. q))

(exp((p+1)*x)/(exp(x)-1)-exp(-c*x)/(exp(x)-1))*a__n/((exp((q+1)*x)/(exp(x)-1)-exp(-d*x)/(exp(x)-1))*b__m)

(1)

 

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