Integrate vs NIntegrate

*To*: mathgroup at smc.vnet.net*Subject*: [mg89129] Integrate vs NIntegrate*From*: "Armen Kocharyan" <armen.kocharyan at gmail.com>*Date*: Mon, 26 May 2008 06:23:35 -0400 (EDT)

Dear group, Why do I get different results (Res1, Res2) in Mathematica 6.0.1.0? *q=-1/2; a=0; b=3;* *h[x_]=(1+x^3)^q;* *f[x_]=Integrate[h[x],x];* *Res1=N[f[b]-f[a]]* *Res2=NIntegrate[h[x],{x,a,b}]* ** *Res1 = -2.55387-2.42865 i* *Res2 = 1.65267* I'm assuming that Res2 is the correct answer. Regards, Armen

**Follow-Ups**:**Re: Integrate vs NIntegrate***From:*danl@wolfram.com

**Re: Integrate vs NIntegrate***From:*"W_Craig Carter" <ccarter@mit.edu>