Working backward from the derivative of a natural log.
0:00 The generalization
2:46 Example #1
6:11 Example #2 (a little harder)
9:00 Example #3 (a little weird)
13:00 Example #4 (trig!)
14:45 Example #5 (who would think to do that!?)
18:26 Example #6 (pulling out all the tricks!)