The so-called integration by parts formula is a direct consequence of Leibniz's formula for derivation of a product (v.s. 5):
In each example, we have to decide who is and who is .
We choose: Therefore: .
In this case it is wise to choose , so the logarithm will ``disappear'':
Thew following example uses the same technique, and its result should be remembered.
Noah Dana-Picard 2007-12-28