Recent content by physicsnewb7

  1. P

    I don't understand the meaning of f^(39)(pi/2)?

    every fourth derivative gives you sin(x) I think you can take it from there
  2. P

    I don't understand the meaning of f^(39)(pi/2)?

    I think they mean take the 39th derivative of sin(x) and evaluate that at pi/2 the 2nd derivative -sin(x) third is -cos(x) and fourth is sin(x)......
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    Why was Tesla obsessed with the number 3?

    I agree. The history channel once upon a time fell in the 0.1% but now...ancient aliens and swamp people lol. The only documentaries I trust now are on science channel.
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    Why was Tesla obsessed with the number 3?

    It's mentioned in the documentary about tesla on the history channel. The name of the documentary is "The History Channel-Modern Marvels:Nikola Tesla:Mad Electricity." Mind you they also air ancient aliens so much its as if they believe aliens were apart of everyday life in antiquity.
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    Laurent series and partial fractions

    Homework Statement find the laurent series of sin(2z)/(z^3) in [z]>0 Homework Equations The Attempt at a Solution I am completely confused. I can understand some of the examples given on laurent series, like using partial fractions and then finding geometric series. Do I rewrite...
  6. P

    Complex analysis

    ohhhhh nevermind i finally got it you rewrite the denominator as (z+i)(z-i) then do the partial fraction. so simple! you were right rizardonthanks
  7. P

    Complex analysis

    So I do the partial fraction after i expand out? expanding (z+i)/(z^2+1) I get (x+yi+i)/(x^2+2xyi-y^2+1) how am I supposed to factor the denominator?
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    Complex analysis

    all i want is a simple hint i don't want anyone to do the problem for me I just want a little help. just a little push in the right direction would be so helpful.
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    Complex analysis

    Homework Statement write f(z)= (z+i)/(z^2+1) in the form w=u(x,y)+iv(x,y) Homework Equations The Attempt at a Solution I tried using the conjugate and also expanding out algebraically but I can not seem to get the right answer. I know what the answer is...
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    Keys are locked

    it turns out that that individual spilt something on it. he just confessed, so a new keyboard it is....
  11. P

    Laplace inverse

    which one??????
  12. P

    Laplace inverse

    Homework Statement s2/((s2-1)(s-1)2) Homework Equations laplace tables The Attempt at a Solution I attempted the shifting method and also partial fraction method but efforts were fruitless
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    Keys are locked

    Someone hit some random combination of keys that locked up some of the keyboard. A few of them started working but there is still a couple that don't work. Does anyone know how to unlock these keys?:uhh:
  14. P

    Simple differential equation

    Thank you very much you have been very helpful. I appreciate it
  15. P

    Simple differential equation

    oh yeah i know i put cos by accident, but that is the solution right? I arrived at this solution by a long trial and error method. any way to quickly get at it in general?
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