professorserna.com

Product to Sum Formulas

I have removed all annotations from my videos that were used to correct errors (YouTube is getting rid of Annotattions) Any errors in the videos have been corrected in the NOTES. If you have already subscribed, you can use your User Name and your Password to download the NOTES in a MS WORD FILE. or a PDF FILE. (If you have trouble downloading the file on your phone, use the Opera Browser) If you haven't subscribed, subscribe now

In this video I show you how to turn a sum of trigonometric functions to a product of trigonometric functions and a product of trigonometric functions to a sum of trigonometric functions. When you take a Calculus course you may find some of these formulas useful.