How to integrate a function

[Goosemaster]

Originally posted by: Howard

Originally posted by: Goosemaster

[e^(2u)]/u - int[(lnu)/u] = int(udu)?

no

1)e^(2u)]/u - int[(lnu)/u]

2)e^(2u)]/u - int(udu)


I lhate writing sh!t over an over again so I jsut keep goign only with what needs work

How is (lnu)du/u = udu?

You used u = (lnu)/u?

Man, I am so going to fail.

no. for this explanation assume that u=x , as it is.


int ( 1/x * ln(x) )

substitute:

same thing as int (u du) where u=lnx and du=1/x

then int (udu) = (u^2)/2
int ( u du )

 

[Goosemaster]

Originally posted by: DrPizza

Originally posted by: DrPizza
Never mind... I figured it out... integration by parts. Twice.

no it isn't either... everything cancelled (I was slowly, but surely typing it in)

really?..oh well... 🙁

 

[Howard]

This is bull****

Anybody wanna hack at the DE here?

http://www.rootminus1.com/howard/homework3.gif

 

[Goosemaster]

I guess i was wrong. huh?🙁

 

[Goosemaster]

Originally posted by: Howard
This is bull****

Anybody wanna hack at the DE here?

http://www.rootminus1.com/howard/homework3.gif

what class are you in?

 

[Howard]

Originally posted by: Goosemaster

Originally posted by: Howard
This is bull****

Anybody wanna hack at the DE here?

http://www.rootminus1.com/howard/homework3.gif

what class are you in?

What do you mean?

 

[NiKeFiDO]

Originally posted by: Goosemaster
I guess i was wrong. huh?🙁

insert foot into mouth...now

 

[Goosemaster]

Originally posted by: Howard

Originally posted by: Goosemaster

Originally posted by: Howard
This is bull****

Anybody wanna hack at the DE here?

http://www.rootminus1.com/howard/homework3.gif

what class are you in?

What do you mean?

caclc 1, 2, 3, Diff eqtns.?

 

[Goosemaster]

Originally posted by: NiKeFiDO

Originally posted by: Goosemaster
I guess i was wrong. huh?🙁

insert foot into mouth...now

what did I do wrong?🙁

 

[DrPizza]

Greeaaaaat. And I see that TuxDave probably made the same mistake 🙂
And, I can't tell Goosemaster's u's from v's...

 

[Goosemaster]

Originally posted by: DrPizza
Greeaaaaat. And I see that TuxDave probably made the same mistake 🙂
And, I can't tell Goosemaster's u's from v's...

dude..that was harsh🙁 I only used the letter V once for writing up the integration by parts values. everywhere else it is a u

 

[Howard]

Originally posted by: Goosemaster

Originally posted by: Howard

Originally posted by: Goosemaster

Originally posted by: Howard
This is bull****

Anybody wanna hack at the DE here?

http://www.rootminus1.com/howard/homework3.gif

what class are you in?

What do you mean?

caclc 1, 2, 3, Diff eqtns.?

Intro to diff eq, I guess.

 

[Howard]

Originally posted by: Goosemaster

Originally posted by: DrPizza
Greeaaaaat. And I see that TuxDave probably made the same mistake 🙂
And, I can't tell Goosemaster's u's from v's...

dude..that was harsh🙁 I only used the letter V once for writing up the integration by parts values. everywhere else it is a u

So much for my handwriting being crap, eh?

 

[Goosemaster]

Originally posted by: Howard

Originally posted by: Goosemaster

Originally posted by: Howard

Originally posted by: Goosemaster

Originally posted by: Howard
This is bull****

Anybody wanna hack at the DE here?

http://www.rootminus1.com/howard/homework3.gif

what class are you in?

What do you mean?

caclc 1, 2, 3, Diff eqtns.?

Intro to diff eq, I guess.

oh...that's different..then you can use diff eqtns theorms😀

hint:
dude..then it is EASY

 

[Goosemaster]

Originally posted by: Howard

Originally posted by: Goosemaster

Originally posted by: DrPizza
Greeaaaaat. And I see that TuxDave probably made the same mistake 🙂
And, I can't tell Goosemaster's u's from v's...

dude..that was harsh🙁 I only used the letter V once for writing up the integration by parts values. everywhere else it is a u

So much for my handwriting being crap, eh?

dude..it is perfectly ledgible (mine)

 

[DrPizza]

C'mon... are you sure it's not e^(x^2)/x
instead of e^2x?


wait a second.... I think I have it.....

 

[Howard]

How is that a freaking hint? Tell me what I did wrong in the first gif I posted.

 

[BrokenVisage]

How to make my frickin head esplode!

 

[Goosemaster]

Originally posted by: DrPizza
C'mon... are you sure it's not e^(x^2)/x
instead of e^2x?


wait a second.... I think I have it.....

lol

 

[Howard]

Originally posted by: DrPizza
C'mon... are you sure it's not e^(x^2)/x
instead of e^2x?


wait a second.... I think I have it.....

Yeah, it's [e^(2x)]/x

 

[Goosemaster]

when you say intro to diff. have you learned what a 1st order diff eqtns is?


<---tryign to figure out what you know and help you....

 

[Howard]

dy/dx + P(x)y = g(x) is the general form of a first-order linear diff eq.

 

[Goosemaster]

Originally posted by: Howard
dy/dx + P(x)y = g(x) is the general form of a first-order linear diff eq.

good. I needed to know if you knew that.

 

[Howard]

Originally posted by: Goosemaster

Originally posted by: Howard
dy/dx + P(x)y = g(x) is the general form of a first-order linear diff eq.

good. I needed to know if you knew that.

Couldn't you see I had already gotten that far in my work?

EDIT: Third line here:

http://www.rootminus1.com/howard/homework.gif

 

[BrokenVisage]

You two wanna get a room to discuss this in already? 😛