Integration by Parts Sec. 6.2
6.3 Integration By Parts Start with the product rule: This is the Integration by Parts formula.
u differentiates to zero (usually). dv is easy to integrate. u differentiates to zero (usually). The Integration by Parts formula is a “product rule” for integration. Choose u in this order: LIPET Logs, Inverse trig, Polynomial, Exponential, Trig
Example 1: LIPET polynomial factor
Example: LIPET logarithmic factor
Example 4: LIPET This is still a product, so we need to use integration by parts again.
Example 7:
Example 8:
Example 5: LIPET This is the expression we started with!
Example 6: LIPET
Example 6: This is called “solving for the unknown integral.” It works when both factors integrate and differentiate forever.
A Shortcut: Tabular Integration Tabular integration works for integrals of the form: where: Differentiates to zero in several steps. Integrates repeatedly.
Compare this with the same problem done the other way:
Example 5: LIPET This is easier and quicker to do with tabular integration!
p
Homework P. 346-347 #1-35 odd Quiz on Integrating tomorrow (definite and indefinite, u-substitution, initial value problems)