Integrating $\int x\arctan(x)dx$ without Tables

  • Context: Undergrad 
  • Thread starter Thread starter bilalbajwa
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    Integration
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Discussion Overview

The discussion revolves around the integration of the function $\int x\arctan(x)dx$, with a specific request from participants to avoid using integration tables. The focus is on exploring different methods and approaches to solve the integral.

Discussion Character

  • Exploratory, Technical explanation, Homework-related, Mathematical reasoning

Main Points Raised

  • One participant expresses a need for a method to solve the integral without using tables.
  • Another participant suggests using integration by parts, proposing to let \( u = \arctan(x) \) and \( v' = 1 \) for the first integration.
  • A different approach is mentioned where the first integration by parts of \( \arctan(x) \) can be avoided by choosing \( u' = x \) and \( v = \arctan(x) \) for integrating \( x \arctan(x) \).
  • Several participants share links to external resources, indicating a search for additional information or methods.

Areas of Agreement / Disagreement

Participants do not reach a consensus on a single method for integration, as multiple approaches are proposed and discussed without agreement on the best one.

Contextual Notes

The discussion does not clarify certain assumptions about the integration techniques or the applicability of the proposed methods, leaving some steps and conditions unresolved.

bilalbajwa
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Hi guys,
Can anybody tell me how to integrate
[tex]\int x\arctan(x) dx[/tex]

I have tried a lot. The condition is i don't want to use integration tables.
 
Last edited:
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I need method to solve it!
 
OK i find that on internet. Thanks viewers.
http://www.maths.abdn.ac.uk/~igc/tch/ma1002/int/node34.html
 
Last edited by a moderator:
I would first integrate arctanx by parts (u=arctanx, v'=1), and then integrate xarctanx by parts (u=x, v'=arctanx)
 
We can avoid the first integration by parts of arctan x by choosing u' = x and v = arctan x for integrating x arctan x
 

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