Trigometri Functions

Positive and negative angles measured in degrees and radians
If a rotating ray is turned in an anticlockwise direction, a positive angle is formed.



The angle is a negative angle if the roataing ray is turned in a clockwise direction.


Exercise 1
Represent each of the following angles in a unit circle . Then state the quadrant in which the angle lies.
1. 220°
2. – 140°
3. 430°
4. 1.2 rad
5. - 2.3 rad
6. 800°
7. – 350 °

Six Trigonometric functions of any angle
Exercise 2

Evaluate
1. sin 280° =
2. cot 70°=
3. cosec (– 350 ° ) =
4. cos 235°=
5 sec 150°=
6 cot (– 650°) =
7 cosec (- 1.2 ) rad =