Solving a Tricky Integral Homework Problem

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SUMMARY

The integral of the function ((x^3) - 1) / ((x^3) + x) dx can be solved using polynomial division rather than partial fractions, as the degrees of the numerator and denominator are equal. The numerator can be factored into (x - 1)((x^2) + x + 1), but this alone does not simplify the integration process. The recommended approach is to perform polynomial long division to rewrite the integral into a more manageable form.

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  • Understanding of polynomial long division
  • Familiarity with integral calculus
  • Knowledge of factoring polynomials
  • Experience with partial fraction decomposition
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  • Study polynomial long division techniques in calculus
  • Review methods for integrating rational functions
  • Practice factoring polynomials and recognizing degrees
  • Explore partial fraction decomposition for different cases
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Students studying calculus, particularly those tackling integral problems involving rational functions, and educators looking for effective teaching methods for integration techniques.

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Homework Statement


Okay, here's the problem: integrate ((x^3) - 1) / ((x^3) + x) dx


Homework Equations


What is the solution and the method?


The Attempt at a Solution


I know this involves partial fractions, which I attempted to no avail, since the numerator is the same degree as the denominator. I even factored the numerator into (x - 1)((x^2) + x + 1), but I can't seem to figure out what to do.
 
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[tex]\int \frac{x^3 - 1}{x^3 + x}\mathrm{d}x[/tex]
If factoring doesn't help, I'd try splitting it into a sum of two integrals.

If you're really stuck, mouseover this for a clue:
x^3 - 1 = (x^3 + x) - (x + 1)
 
Last edited:
Or you can simply divide the numerator by the denominator using polynomial division.
 

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