sage 6.6 gives strange value of a rather common integral:
integral(x/(exp(x)-1),x,0,Infinity)
returns
-1/6*pi^2 + limit(-1/2*x^2 + x*log(-e^x + 1) + polylog(2, e^x), x,
+Infinity, minus)
when it is pi^2/6.
Similar situation with integral(x^3/(exp(x)-1),x,0,Infinity).
Numerical integration works properly.
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