Integration by parts possible?

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SUMMARY

The integral \(\int \frac{1}{(x^2+1)(x+1)} \, dx\) can be effectively solved using the method of partial fractions rather than integration by parts. The discussion highlights attempts to apply integration by parts with functions \(f(x) = \frac{1}{x+1}\) and \(g'(x) = \frac{1}{x^2 + 1}\), which led to complex integrals that were not solvable. The conclusion is that for rational functions, especially in this context, partial fraction decomposition is the optimal approach.

PREREQUISITES
  • Understanding of integral calculus
  • Familiarity with integration by parts
  • Knowledge of partial fraction decomposition
  • Basic algebraic manipulation skills
NEXT STEPS
  • Study the method of partial fraction decomposition in detail
  • Practice solving integrals involving rational functions
  • Review integration by parts with various function combinations
  • Explore advanced techniques in integral calculus, such as trigonometric substitutions
USEFUL FOR

Students studying calculus, particularly those focusing on integration techniques, as well as educators looking for effective methods to teach integration strategies.

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Homework Statement



Calculate:

\integral \frac{1}{(x^2+1)(x+1)}


Homework Equations



\integral f(x) g'(x) = f(x) g(x) - \integral f'(x) g(x) + C

The Attempt at a Solution



I've tried using both 1/(x+1) and 1/(x^2 + 1) as dv, but both end up in another integral I can't solve, one with -ln(x+1) 2x / (x^2+1)^2 and the other with -atan(x)/(x+1)^2.

I think that probably this can only be solved with the method for rational functions (with all the coefficients), but I'm not sure.
 
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Using partial fractions is much better idea.
 
Dick said:
Using partial fractions is much better idea.

Thanks for answering. I know it's much better, but I'm solving some tests (same format) and the position in which this one appears is the "integration by parts question".
 

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