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 Posted: Mon Mar 03, 2008 7:13 pm
iBarty 3.14
Oh, at work today. I came across a guy who was born in 1899. 109 years old.
...he was in the hospital because somebody stabbed him in the spleen. eek
Seriously. He must be tough s**t to piss somebody off enough to stab him in the spleen. And he still lived!
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Posted: Mon Mar 03, 2008 7:23 pm
Someone do my paper for me. It's so stupid.
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Posted: Mon Mar 03, 2008 7:36 pm
3.14 iBarty 3.14
Oh, at work today. I came across a guy who was born in 1899. 109 years old.
...he was in the hospital because somebody stabbed him in the spleen. eek
Seriously. He must be tough s**t to piss somebody off enough to stab him in the spleen. And he still lived!
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Posted: Mon Mar 03, 2008 7:39 pm
Shoujo Phoenix Someone do my paper for me. It's so stupid. Someone do my differential equations homework for me. crying Quote: In each of problems 23 through 30 use the method of reduction of order to find a second solution of the given differential equation. ... 27. xy'' - y' + 4x³y = 0, x > 0; y1(x) = sin(x²) Like seriously, what the <********>. gonk
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Posted: Mon Mar 03, 2008 7:42 pm
Phoenix Goliathane Shoujo Phoenix Someone do my paper for me. It's so stupid. Someone do my differential equations homework for me. crying Quote: In each of problems 23 through 30 use the method of reduction of order to find a second solution of the given differential equation. ... 27. xy'' - y' + 4x³y = 0, x > 0; y1(x) = sin(x²) Like seriously, what the <********>. gonk
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Posted: Mon Mar 03, 2008 7:43 pm
Haha..so far, the most expensive thing I've gotten for my 'cosplay costume' will be the shoes. I haven't gotten them yet, but they're going to cost me $38.68 if it includes the state tax..if not, then it's just $35.99. Either way, I decided to get them mostly because they're like some of the shoes on Gaia. I'm all excited. I'm going to make avi's at a later time to show what I'll be wearing to the con..then I'll be taking pictures too. Oo..that reminds me, I should get film for my camera. My mom's digi can only take like..11 pictures, it's lame. Unless I buy a memory thing for it to up the pictures. I don't know, I'll have to take a look at that I suppose. I'd rather bring one camera rather than two.
But anyway, then after the shoes it would be the Orly hat, and then after that would be a pair of pants I need to get (which I've needed to get for a while anyway...they're getting real faded in the thigh area and just begging to rip open).. As for the cheapest item? The tie which is pure awesome being most run around $15+ (I got mine for $3 something and then there was shipping).
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Posted: Mon Mar 03, 2008 7:43 pm
Phoenix Goliathane Shoujo Phoenix Someone do my paper for me. It's so stupid. Someone do my differential equations homework for me. crying Quote: In each of problems 23 through 30 use the method of reduction of order to find a second solution of the given differential equation. ... 27. xy'' - y' + 4x³y = 0, x > 0; y1(x) = sin(x²) Like seriously, what the <********>. gonk
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Posted: Mon Mar 03, 2008 7:45 pm
Phoenix Goliathane Shoujo Phoenix Someone do my paper for me. It's so stupid. Someone do my differential equations homework for me. crying Quote: In each of problems 23 through 30 use the method of reduction of order to find a second solution of the given differential equation. ... 27. xy'' - y' + 4x³y = 0, x > 0; y1(x) = sin(x²) Like seriously, what the <********>. gonk
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Posted: Mon Mar 03, 2008 7:47 pm
Phoenix Goliathane Shoujo Phoenix Someone do my paper for me. It's so stupid. Someone do my differential equations homework for me. crying Quote: In each of problems 23 through 30 use the method of reduction of order to find a second solution of the given differential equation. ... 27. xy'' - y' + 4x³y = 0, x > 0; y1(x) = sin(x²) Like seriously, what the <********>. gonk ..dude! I am having enough trouble with remembering, like, the Symmetrical Quality of Equality and whatever! D:
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Posted: Mon Mar 03, 2008 8:01 pm
Phoenix Goliathane Shoujo Phoenix Someone do my paper for me. It's so stupid. Someone do my differential equations homework for me. crying Quote: In each of problems 23 through 30 use the method of reduction of order to find a second solution of the given differential equation. ... 27. xy'' - y' + 4x³y = 0, x > 0; y1(x) = sin(x²) Like seriously, what the <********>. gonk 1) divide whole equation by x to get the equation in the form y'' + P(x)y' + Q(x)y = 0 y'' - 1/x * y' + 4x^2y = 0 2) y2 = y1*integral(e^(integral(P(x))dx / y1^2) dx y2 = sin(x^2)*integral(e^(integral(-1/x))dx / sin^2(x^2)) dx ... holy god need pencil and paper brb ok. back. e^integral(-1/x)dx = e^(-ln|x|) = -x thus, y2 = -sin(x^2)*integral(x / sin^2(x^2))dx Using u = x^2, du = 2xdx and substituting for the integral and also knowing that 1 / sin^2(u) = csc^2(u) and its integral is -cot(u), we get y2 = 1/2 * sin(x^2) * cot(x^2) = 1/2 * cos(x^2)
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Posted: Mon Mar 03, 2008 8:02 pm
Thank God for Mathematica's Integrator. The textbook's writer is a sadist.
After half an hour of crying tears of blood, you know what I got? A ******** COSINE FUNCTION OUT OF IT. A ******** COSINE. WHAT THE ********. crying
Natural logarithms and cotangents out the ******** a**, and it ends up being a cosine? This is some extremely sick joke.
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Posted: Mon Mar 03, 2008 8:03 pm
I forgot to ask earlier, any particular reason you left a comment on my page? wink
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Posted: Mon Mar 03, 2008 8:08 pm
Phoenix Goliathane Thank God for Mathematica's Integrator. The textbook's writer is a sadist. After half an hour of crying tears of blood, you know what I got? A ******** COSINE FUNCTION OUT OF IT. A ******** COSINE. WHAT THE ********. crying Natural logarithms and cotangents out the ******** a**, and it ends up being a cosine? This is some extremely sick joke. ... sweatdrop
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Posted: Mon Mar 03, 2008 8:24 pm
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Posted: Mon Mar 03, 2008 8:28 pm
I just looked and realized that you got the answer before I did.
I feel small now. emo
But I think the methodology we're using is slightly different, which is kind of what threw me. I started out with assuming that:
y = v(t)sin(x^2)
Then differentiating that, substituting that in, and...yeah. gonk Though, it does make sense, now that I see it.
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