| 103864 | Finding the Exact Value Using the Formula for the Cosine of the Difference of Two Angles | Easy | |
| 103866 | Finding the Exact Value Using the Formula for the Sum of Two Angles for Cosine | Easy | |
| 103868 | Using Sum and Difference Identities to Evaluate the Difference of Angles | Easy | |
| 103869 | Finding the Exact Value of an Expression Involving an Inverse Trigonometric Function | Easy | |
| 103870 | Finding the Exact Value of an Expression Involving Tangent | Easy | |
| 103873 | Finding a Cofunction with the Same Value as the Given Expression | Easy | |
| 103875 | Verifying an Identity Involving Sine | Easy | |
| 103876 | Verifying an Identity Involving Tangent | Easy | |
| 103877 | Sum and Difference Identities · Try It 5 | Easy | |
| 103878 | Sum and Difference Identities · Exercise 1 | Easy | |
| 103880 | Sum and Difference Identities · Exercise 3 | Easy | |
| 103898 | Sum and Difference Identities · Exercise 21 | Medium | |
| 103912 | Sum and Difference Identities · Exercise 35 | Medium | |
| 103916 | Sum and Difference Identities · Exercise 39 | Medium | |
| 103918 | Sum and Difference Identities · Exercise 41 | Medium | |
| 103920 | Sum and Difference Identities · Exercise 43 | Medium | |
| 103924 | Sum and Difference Identities · Exercise 47 | Deep | |
| 103926 | Sum and Difference Identities · Exercise 49 | Deep | |
| 103928 | Sum and Difference Identities · Exercise 51 | Deep | |
| 103931 | Sum and Difference Identities · Exercise 55 | Deep | |
| 103935 | Using the Double-Angle Formula for Cosine without Exact Values | Easy | |
| 103936 | Using the Double-Angle Formulas to Verify an Identity | Easy | |
| 103937 | Double-Angle, Half-Angle, and Reduction Formulas · Try It 2 | Easy | |
| 103938 | Verifying a Double-Angle Identity for Tangent | Easy | |
| 103939 | Double-Angle, Half-Angle, and Reduction Formulas · Try It 3 | Easy | |
| 103940 | Writing an Equivalent Expression Not Containing Powers Greater Than 1 | Easy | |
| 103941 | Using the Power-Reducing Formulas to Prove an Identity | Easy | |
| 103942 | Double-Angle, Half-Angle, and Reduction Formulas · Try It 4 | Easy | |
| 103943 | Using a Half-Angle Formula to Find the Exact Value of a Sine Function | Easy | |
| 103947 | Double-Angle, Half-Angle, and Reduction Formulas · Exercise 1 | Easy | |
| 103949 | Double-Angle, Half-Angle, and Reduction Formulas · Exercise 3 | Easy | |
| 103951 | Double-Angle, Half-Angle, and Reduction Formulas · Exercise 5 | Medium | |
| 103955 | Double-Angle, Half-Angle, and Reduction Formulas · Exercise 9 | Medium | |
| 103967 | Double-Angle, Half-Angle, and Reduction Formulas · Exercise 21 | Medium | |
| 103969 | Double-Angle, Half-Angle, and Reduction Formulas · Exercise 23 | Medium | |
| 103973 | Double-Angle, Half-Angle, and Reduction Formulas · Exercise 27 | Medium | |
| 103981 | Double-Angle, Half-Angle, and Reduction Formulas · Exercise 35 | Medium | |
| 103983 | Double-Angle, Half-Angle, and Reduction Formulas · Exercise 37 | Medium | |
| 103987 | Double-Angle, Half-Angle, and Reduction Formulas · Exercise 41 | Medium | |
| 103989 | Double-Angle, Half-Angle, and Reduction Formulas · Exercise 43 | Medium | |
| 103991 | Double-Angle, Half-Angle, and Reduction Formulas · Exercise 45 | Medium | |
| 103995 | Double-Angle, Half-Angle, and Reduction Formulas · Exercise 49 | Medium | |
| 104001 | Double-Angle, Half-Angle, and Reduction Formulas · Exercise 55 | Deep | |
| 104003 | Double-Angle, Half-Angle, and Reduction Formulas · Exercise 57 | Deep | |
| 104005 | Double-Angle, Half-Angle, and Reduction Formulas · Exercise 59 | Deep | |
| 104007 | Double-Angle, Half-Angle, and Reduction Formulas · Exercise 61 | Deep | |
| 104009 | Double-Angle, Half-Angle, and Reduction Formulas · Exercise 63 | Deep | |
| 104010 | Writing the Product as a Sum Using the Product-to-Sum Formula for Cosine | Easy | |
| 104012 | Writing the Product as a Sum Containing only Sine or Cosine | Easy | |
| 104014 | Express the Product as a Sum or Difference | Easy | |