1. Section 7.2 Addition and Subtraction Formulas Objectives: To understand how to apply the addition and subtraction formulas.

2. Ex 1. Find the exact value of the trigonometric function. a)sin 150  b)cos 135  c)cos (-60  ) d)csc 225 

3. Class Work 1. tan 300  2. cot 210  3. sin 540  4. sec 630 

4. Formulas for Sine

5. Ex 2. Use an addition or subtraction formula to find the exact value of the expression a)sin 75  b)sin 15 

6. Class Work Use an addition or subtraction formula to find an exact value for the expression. 5.sin 105  6.

7. Formulas for Cosine

8. Ex 3. Use an addition or subtraction formula to find the exact value of the expression a)cos 75  b)

9. Class Work Use an addition or subtraction formula to find an exact value for the expression. 7. 8. cos 15 

10. Formulas for Tangent

11. Ex 4. Use an addition or subtraction formula to find an exact value for the expression. a)tan 165  b)

12. Class Work 9. 10. tan 15 

13. HW#1 Worksheet 7.2