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## #1 2009-02-04 06:56:02

Daniel123
Member
Registered: 2007-05-23
Posts: 663

### Quick integral

Having just evaluated 45 integrals, my brain has gone numb.

Can someone please tell me what to do for this:

Thanks.

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## #2 2009-02-04 07:30:17

George,Y
Member
Registered: 2006-03-12
Posts: 1,306

a/(aa+4) ?

X'(y-Xβ)=0

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## #3 2009-02-04 07:32:41

Daniel123
Member
Registered: 2007-05-23
Posts: 663

George,Y wrote:

a/(aa+4) ?

Sorry?

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## #4 2009-02-04 09:04:07

mathsyperson
Moderator
Registered: 2005-06-22
Posts: 4,900

### Re: Quick integral

I think George is substituting, using

.

Why did the vector cross the road?
It wanted to be normal.

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## #5 2009-02-04 09:07:43

TheDude
Member
Registered: 2007-10-23
Posts: 361

### Re: Quick integral

That's not what it comes out to though.  Using that substitution gives

, which I'm not certain is better than what we started with.

Wrap it in bacon

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## #6 2009-02-04 09:50:37

luca-deltodesco
Member
Registered: 2006-05-05
Posts: 1,470

### Re: Quick integral

Last edited by luca-deltodesco (2009-02-04 10:07:32)

The Beginning Of All Things To End.
The End Of All Things To Come.

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## #7 2009-02-04 09:59:15

JaneFairfax
Member
Registered: 2007-02-23
Posts: 6,868

### Re: Quick integral

TheDude wrote:

, which I'm not certain is better than what we started with.

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## #8 2009-02-04 10:08:05

TheDude
Member
Registered: 2007-10-23
Posts: 361

### Re: Quick integral

JaneFairfax wrote:
TheDude wrote:

, which I'm not certain is better than what we started with.

Well, when you put it like that, it is better

Wrap it in bacon

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## #9 2009-02-04 12:07:32

Daniel123
Member
Registered: 2007-05-23
Posts: 663

### Re: Quick integral

Thanks guys and girls

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