Sum and Difference Formulas for Sine, Cosine, and Tangent
Example 1: Finding and exact value of an angle
Example 2: Verifying an Identity Using Sum and Difference Formula
Example 3: Sum Formula for Sine
Example 4: Difference Formula for Sine
Example 5: Sum and Difference Formulas for Sine and Cosine
Example 6: Sum and Difference Formulas for Tangent