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Christos Group Title

Whats the integral of ln(x^2) ?

  • one year ago
  • one year ago

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  1. zzr0ck3r Group Title
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    ln(x^2) = 2ln(x)

    • one year ago
  2. zzr0ck3r Group Title
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    what is the integral of ln(x)?

    • one year ago
  3. Christos Group Title
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    1/x ?

    • one year ago
  4. zzr0ck3r Group Title
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    no that's the derivative

    • one year ago
  5. Christos Group Title
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    wait

    • one year ago
  6. zzr0ck3r Group Title
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    hint: let u = ln(x) and let dv = 1 dx

    • one year ago
  7. zzr0ck3r Group Title
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    try not to just give answers? we can go to wolfram for that

    • one year ago
  8. primeralph Group Title
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    @zzr0ck3r still not the final answer; but I'll take it off

    • one year ago
  9. Christos Group Title
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    xln(x) ? I still refuse to go by the answer :D

    • one year ago
  10. primeralph Group Title
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    @Christos xlnx is not the answer. Use integration by parts

    • one year ago
  11. Christos Group Title
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    xln(x)-1

    • one year ago
  12. zzr0ck3r Group Title
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    if you are just guessing you can go to wolframalpha and get the answer

    • one year ago
  13. Christos Group Title
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    I am not guessing I though x has a power of 1 so -1 at the end and outside of ln whatever is inside

    • one year ago
  14. Christos Group Title
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    I saw it somewhere long time ago but im not sure if its correct

    • one year ago
  15. zzr0ck3r Group Title
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    u need to do integration by parts

    • one year ago
  16. zzr0ck3r Group Title
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    is that what you are doing in class?

    • one year ago
  17. Christos Group Title
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    What is this, can you give me an example?

    • one year ago
  18. Christos Group Title
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    I am learning alone.

    • one year ago
  19. zzr0ck3r Group Title
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    do you know what the product rule is with derivatives?

    • one year ago
  20. Christos Group Title
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    I do

    • one year ago
  21. zzr0ck3r Group Title
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    it is like the inverse of that, it is how we undo that rule.

    • one year ago
  22. zzr0ck3r Group Title
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    I would google it and read on it, it takes practice

    • one year ago
  23. Christos Group Title
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    the reverse?

    • one year ago
  24. zzr0ck3r Group Title
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    sort of

    • one year ago
  25. zzr0ck3r Group Title
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    do you know u substitution for integration?

    • one year ago
  26. Christos Group Title
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    yes

    • one year ago
  27. zzr0ck3r Group Title
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    ok that "undoes" the chain rule, so now you need to learn by parts. there are both crucial to learning integration http://tutorial.math.lamar.edu/Classes/CalcII/IntegrationByParts.aspx

    • one year ago
  28. Christos Group Title
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    Look at this please: That's specifically what am trying to solve. http://screencast.com/t/0N48E4lhqM9

    • one year ago
  29. zzr0ck3r Group Title
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    e^(2*lnx) = e^ln(x^2) = x^2 so you need the integral of x^2 not ln(x^2)

    • one year ago
  30. Christos Group Title
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    I solved it now :D I know how to find this thing very easy (x^3)/3 without any actual formula

    • one year ago
  31. zzr0ck3r Group Title
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    yeah:)

    • one year ago
  32. Christos Group Title
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    thanks

    • one year ago
  33. zzr0ck3r Group Title
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    np

    • one year ago
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