This is a fun digital matching and puzzle assembling activity on sum to product trigonometric identities. On the first slide there are given the 12 problems numbered with 1a,2a,3a,4a, 1b,2b,3b,4b, 1c,2c,3c,4c. Students have to find the exact value of each sum or difference or to express it as a product. On the second slide the answers of the problems are given in random order. Students have to type the number of each problem next to its answer in the empty box provided (matching). There is also