Phase Shift

The University of Idaho provides an online resource.  These lectures are only viewable by those with DSL or cable modems.  Real Player, a free download, is required to see these videos.
Horizontal Translations and the definition of phase shift
Sketching functions of the form Y=a sin (x-b) + c
Sketching functions of the form Y=a sin b(x-c) + d

Watch the lesson on mathtv.com. Click the play button in the lower left corner of the video lesson screen.  It requires Real Player, a free download.

Phase shift
Here is an online multiple choice quiz about Trig graphs.