| 104016 | Writing the Difference of Sines as a Product | Easy | |
| 104018 | Evaluating Using the Sum-to-Product Formula | Easy | |
| 104019 | Proving an Identity | Easy | |
| 104020 | Verifying the Identity Using Double-Angle Formulas and Reciprocal Identities | Easy | |
| 104021 | Sum-to-Product and Product-to-Sum Formulas · Try It 5 | Easy | |
| 104022 | Sum-to-Product and Product-to-Sum Formulas · Exercise 1 | Easy | |
| 104026 | Sum-to-Product and Product-to-Sum Formulas · Exercise 5 | Medium | |
| 104030 | Sum-to-Product and Product-to-Sum Formulas · Exercise 9 | Medium | |
| 104045 | Sum-to-Product and Product-to-Sum Formulas · Exercise 25 | Medium | |
| 104053 | Sum-to-Product and Product-to-Sum Formulas · Exercise 33 | Medium | |
| 104055 | Sum-to-Product and Product-to-Sum Formulas · Exercise 35 | Medium | |
| 104057 | Sum-to-Product and Product-to-Sum Formulas · Exercise 37 | Medium | |
| 104059 | Sum-to-Product and Product-to-Sum Formulas · Exercise 39 | Medium | |
| 104063 | Sum-to-Product and Product-to-Sum Formulas · Exercise 43 | Medium | |
| 104075 | Sum-to-Product and Product-to-Sum Formulas · Exercise 55 | Deep | |
| 104077 | Sum-to-Product and Product-to-Sum Formulas · Exercise 57 | Deep | |
| 104079 | Sum-to-Product and Product-to-Sum Formulas · Exercise 59 | Deep | |
| 104081 | Sum-to-Product and Product-to-Sum Formulas · Exercise 61 | Deep | |
| 104083 | Sum-to-Product and Product-to-Sum Formulas · Exercise 63 | Deep | |
| 107348 | Finding the Exact Value Using the Formula for the Sum of Two Angles for Cosine | Easy | |
| 107350 | Using Sum and Difference Identities to Evaluate the Difference of Angles | Easy | |
| 107351 | Finding the Exact Value of an Expression Involving an Inverse Trigonometric Function | Easy | |
| 107361 | Sum and Difference Identities · Exercise 43 | Medium | |
| 107367 | Using the Double-Angle Formulas to Establish an Identity | Easy | |
| 107368 | Double-Angle, Half-Angle, and Reduction Formulas · Try It 2 | Easy | |
| 107369 | Using a Half-Angle Formula to Find the Exact Value of a Sine Function | Easy | |
| 107371 | Double-Angle, Half-Angle, and Reduction Formulas · Exercise 9 | Medium | |
| 107378 | Double-Angle, Half-Angle, and Reduction Formulas · Exercise 35 | Medium | |
| 107380 | Double-Angle, Half-Angle, and Reduction Formulas · Exercise 37 | Medium | |
| 107383 | Evaluating Using the Sum-to-Product Formula | Easy | |
| 107392 | Sum-to-Product and Product-to-Sum Formulas · Exercise 39 | Medium | |
| 107394 | Sum-to-Product and Product-to-Sum Formulas · Exercise 41 | Medium | |
| 107396 | Sum-to-Product and Product-to-Sum Formulas · Exercise 43 | Medium | |
| 103865 | Sum and Difference Identities · Try It 1 | Easy | |
| 103867 | Sum and Difference Identities · Try It 2 | Easy | |
| 103871 | Sum and Difference Identities · Try It 3 | Easy | |
| 103874 | Sum and Difference Identities · Try It 4 | Easy | |
| 103882 | Sum and Difference Identities · Exercise 5 | Medium | |
| 103884 | Sum and Difference Identities · Exercise 7 | Medium | |
| 103886 | Sum and Difference Identities · Exercise 9 | Medium | |
| 103888 | Sum and Difference Identities · Exercise 11 | Medium | |
| 103890 | Sum and Difference Identities · Exercise 13 | Medium | |
| 103892 | Sum and Difference Identities · Exercise 15 | Medium | |
| 103894 | Sum and Difference Identities · Exercise 17 | Medium | |
| 103896 | Sum and Difference Identities · Exercise 19 | Medium | |
| 103900 | Sum and Difference Identities · Exercise 23 | Medium | |
| 103910 | Sum and Difference Identities · Exercise 33 | Medium | |
| 103914 | Sum and Difference Identities · Exercise 37 | Medium | |
| 103922 | Sum and Difference Identities · Exercise 45 | Medium | |
| 103934 | Double-Angle, Half-Angle, and Reduction Formulas · Try It 1 | Easy | |