No. 6 Finding the Exact Value of a Trigonometric Function by Using a Double Angle Formula
No. 10 Solving a Trigonometric Equation by Using a Double Angle Formula
No. 16 Solving a Trigonometric Equation by Using the Double Angle Formulas
No. 26 Finding the Exact Values of Trigonometric Functions by Using the Double Angle Formulas
No. 34 Rewriting a Given Expression by Using the Power-Reducing Formulas
No. 38 Finding the Exact Values of a Trigonometric Function by Using the Half-Angle Formulas
No. 47 Finding the Exact Values of Trigonometric Functions by Using the Half-Angle Formulas
No. 51 Finding the Exact Values of Trigonometric Functions by Using the Half-Angle Formulas
No. 60 Solving a Trigonometric Equation by Using a Half-Angle Formula
No. 66 Writing a Product as a Sum or Difference by Using a Product-to-Sum Formula
No. 78 Writing a Difference as a Product by Using a Sum-to-Product Formula