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Definite integration error in MMA 3.0


Hello, 

I found a wrong result performing a symbolic definite integral with 
MMA3.0 running under Linux.

           A=Integrate[1/Sqrt[1+t+t^4], {t,0,Infinity}]

As espected A is expressed in terms of elliptic integrals, but 
when evaluated 

                 N[A,40]=-2.2405.......

that is obviously wrong.

NIntegrate produces A=1.66159.....


It is this a known problem? 

ciotti luca
osservatorio astronomico di bologna
via zamboni 33
40126 bologna (italy)


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