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Christos

  • one year ago

Whats the integral of ln(x^2) ?

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  1. zzr0ck3r
    • one year ago
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    ln(x^2) = 2ln(x)

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

  3. Christos
    • one year ago
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    1/x ?

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

  5. Christos
    • one year ago
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    wait

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

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

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

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

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

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

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

  13. Christos
    • one year ago
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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

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

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

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

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

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

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

  20. Christos
    • one year ago
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    I do

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

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

  23. Christos
    • one year ago
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    the reverse?

  24. zzr0ck3r
    • one year ago
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    sort of

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

  26. Christos
    • one year ago
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    yes

  27. zzr0ck3r
    • one year ago
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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

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

  29. zzr0ck3r
    • one year ago
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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)

  30. Christos
    • one year ago
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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

  31. zzr0ck3r
    • one year ago
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    yeah:)

  32. Christos
    • one year ago
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    thanks

  33. zzr0ck3r
    • one year ago
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    np

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