1. 7-4 Formulas Angle Addition/Subtraction

2. Lets try an experiment? What is ? Is it equal to This demonstrates that trigonometric functions are not distributive. Imagine

3. The Formulas Based on Geometry and distance Formula

5. What do these formulas do? Essentially give you the option of a)finding the sin/cos of an angle that can be made up of two angles you know. While you don’t know the cos 75 °, you know that 75° is made up of two angles that you know. b)Going backwards, and “compressing” an expanded formula into a form you can solve.

6. Examples Find the following 1. 2. Prove by angle addition formulas. 3.

7. Examples Find the following 4. 5. 6.

8. Examples 7. Given, and Find