Howdy,

Trying to integrate

2

Again..

Substitute back into2

But this is wrong (Crying)

¿Porque?¿

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- Aug 12th 2009, 03:26 PMJonesAnother integration by parts problem
Howdy,

Trying to integrate

**2**

Again..

Substitute back into**2**

But this is wrong (Crying)

¿Porque?¿ - Aug 12th 2009, 04:03 PMred_dog
This is the general form of the integral:

Here is another method, without using integration by parts:

- Aug 12th 2009, 04:06 PMskeeter
parts is too much work ...

----------------------------------------------------------

add up the terms of both equations ...

integrate the RHS - Aug 12th 2009, 04:50 PMSoroban
Hello, Jones!

skeeter is right . . . "by parts" is a lot of work.

Here it is . . . in case you*ever*get that desperate.

Quote:

Integrate: .

By parts: .

. . We have: .

By parts: .

. . We have: .

We have: .

. . Then: .

. . Multiply by

Therefore: .

- Aug 13th 2009, 01:29 AMJones
Thanks,

How do you know when to use integration by parts and when not to use it?

I thought you always had to use it if you had a product of two functions =/ - Aug 13th 2009, 02:18 AMProve It
You use integration by parts if two situations hold...

1. One of the functions in the product should be easy to differentiate and one should be easy to integrate.

2. By integrating and differentiating the correct functions, the new integral is reduced to something easier to integrate.