[Maxima] GosperSum division by zero

[bantone at web.de]

Hi,

I tried to find a closed form for this simple summation:

   GosperSum(sin(b*n), n, 0, N);

I get this error message:

Division by 0
#0: intLinPolyNorm(expr=sin(b*(n+1)),k=n)(norm.mac line 26)
#1: intLinNorm(expr=sin(b*(n+1)),k=n)(norm.mac line 45)
#2: intLinNormList(exprlist=[sin(b*(n+1))],k=n)(norm.mac line 135)
 -- an error.  Quitting.  To debug this try debugmode(true);

Is there a way to work around this?

gr.
Anton