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How do they derive from equation A to B?

  1. Sep 22, 2012 #1
    My question is how to get from equation A to B.
    By using partial fractions? differential? any methods?

    Attached Files:

  2. jcsd
  3. Sep 22, 2012 #2
    Don't use attachments as it makes very cumbersome reading the question and answering it. Write down the stuff using LaTeX for mathematics.

  4. Sep 22, 2012 #3


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    Hey timeforchg and welcome to the forums

    Do you have any conditions? Are you assuming A = B and trying to go from A to B while maintaining an equality?
  5. Sep 22, 2012 #4

    yes. I think is more simplifying the equation.

    I am trying to find the limit z = 0. When I see inside my text before they use l'hopital rule, they simplified the equation A to B. Thereafter they apply the l'hopital rule
  6. Sep 22, 2012 #5


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    Ohh, next time you use a limit please specify this in the equation so there is no ambiguity or confusion.

    I have a feeling you have got the equation wrong: if you take the limit in this case to go to zero, the top goes to 0 but the bottom doesn't (it goes to 3-j which may not be zero and is only zero if 3 = j).
  7. Sep 23, 2012 #6
    there is no + in eq A for the denominator
  8. Sep 23, 2012 #7


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    Can you please write out the expression on the denominator?
  9. Sep 23, 2012 #8
    SOLVED!! Thanks a lot guys!! Appreciate it.
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