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Calling all math geniuses on this forum! I've got another calculus problem I need help with, much appreciated if someone can provide me with the solution.
Let f be a continuous function on R. Given
F(x) = ∫ f (t) (x-t) dt
Evaluate F''(x) <--- note: 2 derivatives, not one, meaning d^2y/dx^2
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For that above equation, the upper limits of the integral ∫ is x, and lower limits is a.
Post edited November 20, 2009 by lowyhong
No posts in this topic were marked as the solution yet. If you can help, add your reply
Have you tried exercising the power of Wolfram Alpha?
I have the answer, but I'd like to see the solution, as this is a potential question for my exams.
nvm I realized Wolfram does this too. Hang on I'll check it out.
Post edited November 20, 2009 by lowyhong
My gut feeling says to use the fundamental theorem of calculus ><
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Tserge: My gut feeling says to use the fundamental theorem of calculus ><

Hey bro glad you're online. Hmm do I use the formula with lim h->0?
To be honest, I don't have the answer, what's the solution though? ><
I don't know, the prof got stingy with the solutions. All I have are partial solutions that discuss every other question except for this one that I'm stuck on :(
Is the answer London?
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Navagon: Is the answer London?

No, it's got to be badger.
This is Whiskey Tango Foxtrot to stonebro. stonebro are you there stonebro? Over.
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lowyhong: I don't know, the prof got stingy with the solutions. All I have are partial solutions that discuss every other question except for this one that I'm stuck on :(

Time for an good old fashion email or visit then? Unless of course the paper is on next monday.
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lowyhong: This is Whiskey Tango Foxtrot to stonebro. stonebro are you there stonebro? Over.

Edit; scratch that, you can actually use the fundamental theorem directly.
With F(x) = ∫ f(t) dt and limits a,x, you have F'(x) = f(x).
Post edited November 20, 2009 by stonebro
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Navagon: Is the answer London?
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Miaghstir: No, it's got to be badger.

I thought it might be fox. But maybe I'm being mislead by... it all.
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stonebro: Edit; scratch that, you can actually use the fundamental theorem directly.
With F(x) = ∫ f(t) dt and limits a,x, you have F'(x) = f(x).

Ah many thanks for confirming this stonebro.
But I still don't quite understand. The answer given is F''(x) = f(x). My problem is, there is the (x-t) right after f(t). How do I get rid of that?
PS. do you have MSN?
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Tserge: Time for an good old fashion email or visit then? Unless of course the paper is on next monday.

Unfortunately it is :( Curse the Mathematics department.
Post edited November 20, 2009 by lowyhong
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stonebro: Edit; scratch that, you can actually use the fundamental theorem directly.
With F(x) = ∫ f(t) dt and limits a,x, you have F'(x) = f(x).
avatar
lowyhong: Ah many thanks for confirming this stonebro.
But I still don't quite understand. The answer given is F''(x) = f(x). My problem is, there is the (x-t) right after f(t). How do I get rid of that?
PS. do you have MSN?
avatar
Tserge: Time for an good old fashion email or visit then? Unless of course the paper is on next monday.

Unfortunately it is :( Curse the Mathematics department.

I have MSN .. I might be without internet for a couple of days though as my last payment didn't go through and I was cut off .. writing from work now :(
I don't quite know how far you are in maths. Have you covered Taylor's Theorem yet? It might be that you can use that as well, since the construct f(t)*(x - t) is exactly the kind of thing you keep seeing in Taylor's Theorem.
Post edited November 20, 2009 by stonebro