Re: (Not trivial) Definite Integration of a rational function
- To: mathgroup at smc.vnet.net
- Subject: [mg74787] Re: (Not trivial) Definite Integration of a rational function
- From: Bhuvanesh <lalu_bhatt at yahoo.com>
- Date: Thu, 5 Apr 2007 04:10:48 -0400 (EDT)
- Organization: The Math Forum
Offhand I'm not sure why this failed in 5.2, but it works in the development version:
In[1]:= Integrate[(2*x)/((x + 1)*(x^3 + 3*x^2 + 2*x + 1)), {x, 0, Infinity}] //Timing //InputForm
Out[1]//InputForm=
{0.85, -2*RootSum[1 + 2*#1 + 3*#1^2 + #1^3 & ,
(Log[-#1] + 2*Log[-#1]*#1 + Log[-#1]*#1^2)/(2 + 6*#1 + 3*#1^2) & ]}
In[2]:= N[Last[%], 20]
-20
Out[2]= 0.37121697526024703447 + 0. 10 I
Bhuvanesh,
Wolfram Research.