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12-03-2013, 06:03 PM   #9701
laid-to-waste
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Join Date: Mar 2011
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Quote:
 Originally Posted by Ssargentslayer Itt's calculus. He's just making a substitution cause that's how the question is solved. Be more specific, what about the substitution don't you get? Why he's doing it?

this confuses me:

Let y = xv, which gives y' = v+x dv/dx

it does check out, but i dunno how it was found. the part after gives, not the part before.

i figured it would be the product rule, but i don't understand why a dv/dx is produced and not a dy/dx
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Last edited by laid-to-waste : 12-03-2013 at 06:04 PM.

12-03-2013, 06:08 PM   #9702
Ssargentslayer
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Join Date: Sep 2007
Location: Calgary, Canada
Quote:
 Originally Posted by laid-to-waste this confuses me: Let y = xv, which gives y' = v+x dv/dx it does check out, but i dunno how it was found. the part after gives, not the part before. i figured it would be the product rule, but i don't understand why a dv/dx is produced and not a dy/dx

y'=dy/dx

so you have

dy/dx=d/dx(xv)=v+x*(dv/dx)
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12-03-2013, 06:21 PM   #9703
laid-to-waste
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Join Date: Mar 2011
Location: Manchester, UK
Quote:
 Originally Posted by Ssargentslayer y'=dy/dx so you have dy/dx=d/dx(xv)=v+x*(dv/dx)

yea i was just being dense.

one more thing

the way i worked it out, i got

e^constant + sin(v) = x

so

arcsin(x+e^constant) = v

or

arcsin (x+constant) = v

but i dunno why it's arcsin (x*constant)
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Quote:
 Originally Posted by vintage x metal I just looked at your pics; you're very cute

Quote:
 Originally Posted by skylerjames13 you've got the sickest abs i've ever seen and it's enough to turn me gay
Quote:
 Originally Posted by MetalMullet you look pretty curved mate!

complement my abs or physique or general attractiveness for your chance to be quoted right here

12-03-2013, 06:25 PM   #9704
Ssargentslayer
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Join Date: Sep 2007
Location: Calgary, Canada
Quote:
 Originally Posted by laid-to-waste yea i was just being dense. one more thing the way i worked it out, i got e^constant + sin(v) = x so arcsin(x+e^constant) = v or arcsin (x+constant) = v but i dunno why it's arcsin (x*constant)

I'm gunna take a shot in the dark and say you did e^(log(x)+c)=x+e^c
It should be x*e^c
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Quote:
 Originally Posted by MetalMullet Your username is dumb.
Call me Keenan
Quote:
 Originally Posted by BladeSlinger I basically slap my dick on my girlfriend's stomach until I get off.
brot pls
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12-03-2013, 06:43 PM   #9705
laid-to-waste
...BlTCH

Join Date: Mar 2011
Location: Manchester, UK
thanks guys
__________________
Quote:
 Originally Posted by vintage x metal I just looked at your pics; you're very cute

Quote:
 Originally Posted by skylerjames13 you've got the sickest abs i've ever seen and it's enough to turn me gay
Quote:
 Originally Posted by MetalMullet you look pretty curved mate!

complement my abs or physique or general attractiveness for your chance to be quoted right here

12-03-2013, 06:47 PM   #9706
Neo Evil11
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Join Date: Feb 2006
Location: Arkham Asylum
Quote:
 Originally Posted by laid-to-waste thanks guys

I'm sorry, but it was way to massive to do it by myself. Always use substitution when you are stuck.
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12-03-2013, 06:52 PM   #9707
laid-to-waste
...BlTCH

Join Date: Mar 2011
Location: Manchester, UK
Quote:
 Originally Posted by Neo Evil11 I'm sorry, but it was way to massive to do it by myself. Always use substitution when you are stuck.

i reckon that advice will actually help me a lot. cheers!
__________________
Quote:
 Originally Posted by vintage x metal I just looked at your pics; you're very cute

Quote:
 Originally Posted by skylerjames13 you've got the sickest abs i've ever seen and it's enough to turn me gay
Quote:
 Originally Posted by MetalMullet you look pretty curved mate!

complement my abs or physique or general attractiveness for your chance to be quoted right here

12-03-2013, 07:13 PM   #9708
Neo Evil11
UG Addict

Join Date: Feb 2006
Location: Arkham Asylum
Quote:
 Originally Posted by laid-to-waste i reckon that advice will actually help me a lot. cheers!

Yeah there are only a couple of tricks in which you can solve differential equations:
-either you can seperate x and y to the different sides and simply integrate
-exact equations: when M(x,y)+N(x,y)y'=0 where M=dF/x and N=dF/y. Check if second derivatives are euqal: dM/dy=dN/dx. In that case integrate over one side, and then differentiate again to the variable you did not integrate over to find out what the last part is. Use an integrating factor if necessary.
-homogeneous functions: introduce a new variable.
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Quote:
 Originally Posted by Carmel I can't believe you are whoring yourself out like that.

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12-03-2013, 07:28 PM   #9709
Ssargentslayer
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Join Date: Sep 2007
Location: Calgary, Canada
I don't like calculus. There's far too many random tricks to remember.
__________________
Quote:
 Originally Posted by MetalMullet Your username is dumb.
Call me Keenan
Quote:
 Originally Posted by BladeSlinger I basically slap my dick on my girlfriend's stomach until I get off.
brot pls
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12-03-2013, 08:34 PM   #9710
laid-to-waste
...BlTCH

Join Date: Mar 2011
Location: Manchester, UK
i'm not doing all that well in real analysis. it's a little difficult to grasp
__________________
Quote:
 Originally Posted by vintage x metal I just looked at your pics; you're very cute

Quote:
 Originally Posted by skylerjames13 you've got the sickest abs i've ever seen and it's enough to turn me gay
Quote:
 Originally Posted by MetalMullet you look pretty curved mate!

complement my abs or physique or general attractiveness for your chance to be quoted right here

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