7.3 Addition & Subtraction Formulas

3

2

1Special Angles, Co-functions & Quadrants

Addition & Subtraction Formulas

Practice Problems

2

Special AnglesDegrees

Radians

SIN COS TAN COT SEC CSC

0˚ 0 0 1 0 U 1 U

30˚ 245˚ 1 160˚ 290˚ 1 0 U 0 U 1

22

22

21

6

2

4

3

23

21

23

33

3

3

33

332

2 2

332

3

Special Angles (Cont.)Degrees Radians SIN COS

135˚180˚ 0 -1225˚270˚ -1 0315˚

43

45

23

47

22

22

22

22

22

22

4

Cofunctions

cossin cofunction sincos cofunction

cscsec cofunction seccsc cofunction

cottan cofunction tancot cofunction

5

Signs of Trigonometric Functions

6

Addition & Subtraction Formulas

vuvuvu sinsincoscos)cos(

vuvuvu sinsincoscos)cos(

vuvuvu sincoscossin)sin(

vuvuvu sincoscossin)sin(

7

Addition & Subtraction Formulas

vuvuvu

tantan1tantan)tan(

vuvuvu

tantan1tantan)tan(

8

Examples

9

More Examples

10

Practice Problems Page 531

Problems 1-22

11

Practice Problems Page 531

Problems 23-44