**Learning objectives**

- Establish the discrete cosine transform
- Rotate the axes to diagonalize quadratic forms

**Before class**

- Read Lay section 7.2
- Get started with notes on discrete cosine transform
- Consult notes to the textbook (if you wish)
- Ponder Lay problems 7.2: 3, 7, 21.
- Post to Piazza
- Write solutions to problems 6.4: 2, 10, 14; 6.5: 2; 7.1: 18, 25 to turn in at the beginning of class

**In class**

- Prepare for Thursday’s test
- Work through notes on cosine transform
- Work problems on quadratic forms