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henpen Group Title

\[ \int \frac{x}{x^2+1}dx \]

  • one year ago
  • one year ago

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  1. phi Group Title
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    this (almost) looks like u^-1 du

    • one year ago
  2. henpen Group Title
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    This smells of parts, but I'm having trouble with \[\int\limits \frac{1}{x^2+1}dx\]

    • one year ago
  3. sirm3d Group Title
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    that is arctangent

    • one year ago
  4. henpen Group Title
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    Although that might not help

    • one year ago
  5. sirm3d Group Title
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    can you enlighten us with the problem?

    • one year ago
  6. klimenkov Group Title
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    Do a substitution \(u=x^2, du=2xdx\)

    • one year ago
  7. henpen Group Title
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    \[0.5 \ln(u+1)\]

    • one year ago
  8. henpen Group Title
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    @sirm3d It's halfway through the DE of my last question

    • one year ago
  9. klimenkov Group Title
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    Yes. Now make the inverse substitution.

    • one year ago
  10. sirm3d Group Title
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    post a link @henpen

    • one year ago
  11. henpen Group Title
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    http://openstudy.com/users/henpen#/updates/50968019e4b0d0275a3ce47b

    • one year ago
  12. sirm3d Group Title
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    hmm, can we try reduction of order with \[y=v(ix)\]

    • one year ago
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