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What am I doing wrong here?

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Old Mar 17, 2009 | 02:33 PM
  #31  
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fuck, i rather see post about homo shit than this fucking thing you guys call math.
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Old Mar 17, 2009 | 02:36 PM
  #32  
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i find math interesting h:
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Old Mar 17, 2009 | 02:39 PM
  #33  
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Originally Posted by RicoD
dude post your resources online... h: that stuff helps
its all in my brain :loco:

Originally Posted by RicoD
i find math interesting h:
it makes me miss teaching/tutoring, i need me a jay-oooh-beeeeee
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Old Mar 17, 2009 | 02:40 PM
  #34  
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i meant the online resources if you have any more...
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Old Mar 17, 2009 | 02:47 PM
  #35  
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dude, I whipped something up real quick. You can simplify this:



Like I see a 2 that can be factored out etc.
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Old Mar 17, 2009 | 02:48 PM
  #36  
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i just googled "ln derivative" and went to the first few hits

wathworld is legit, lots of good stuff there, mathtopia sp? was good i think
i havent done anything with math for a few years now so im a bit out of the loop

i used to try to use university web pages alot though, classes with notes online are super useful, and questions are pretty universal if you know what i mean :rick:
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Old Mar 17, 2009 | 02:51 PM
  #37  
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Originally Posted by cpvdh
i just googled "ln derivative" and went to the first few hits

wathworld is legit, lots of good stuff there, mathtopia sp? was good i think
i havent done anything with math for a few years now so im a bit out of the loop

i used to try to use university web pages alot though, classes with notes online are super useful, and questions are pretty universal if you know what i mean :rick:
I think he knows how to compute the ln derivative, I just don't think he knows how to break it up.

Originally Posted by F22B Prelude
y = ln(x^4+5x^2)^3/2

y' = ((1/x^4+5x^2)(4x^3+10x))^3/2

= 3/2(4x^3+10x/x^4+5x^2)

You just didn't use the chain rule right, see above post

edit: verified with my calculator (sort of). My calc minimized it a lil bit but it looks to be similar.
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Old Mar 17, 2009 | 02:52 PM
  #38  
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This shit is fuckin gay, my book doesn't give me anything, I had to go online to get as far as i got....ill keep trying until i get it right
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Old Mar 17, 2009 | 02:53 PM
  #39  
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Originally Posted by F22B Prelude
This shit is fuckin gay, my book doesn't give me anything, I had to go online to get as far as i got....ill keep trying until i get it right
My shit should help!
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Old Mar 17, 2009 | 02:58 PM
  #40  
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Originally Posted by Red X
dude, I whipped something up real quick. You can simplify this:



Like I see a 2 that can be factored out etc.
oh holy fuck dont do it that way

y=ln(x^4 + 5x^2)^(3/2)
use ln manip. to get
y=(3/2)(ln(x^4 + 5x^2)

then use the def of deriv of ln to get
y'=(3/2) [(1/(x^4 + 5x^2))(4x^3 + 10x)]

simplify
y'=(12x^3 + 30x)/(2x^4 + 10x^2)


basically y=ln(x)
y'=(dx/x)
but only for lower level stuff, dont do this in 253 or above
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