This PowerPointâ„¢ lesson teaches students from Precalculus to Calculus about Sum and Difference Formulas. The lesson requires no extra work on the teacher's part. Display it via a projector or interactive board/tv, click through the slides which include animation and natural transitions, while walking around the room engaging with your students. This is also a great tool for asynchronous learning (easy to share with students to work through on their own time, and perfect for making videos).The le