Section 7.5
Unit Circle Approach;
Properties of the
Trigonometric Functions
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.
Find the exact value of:
(a) cos 480°
11
(b) tan
4
7
(c) sin
3
(a) cos 480  cos 120  360   cos120  
1
2
11
3
 3

(b) tan
 tan 
 2   tan
 1
4
4
 4

(c) sin
7

3


 sin   2   sin 
3
3
2
3

Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.
Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.
Find the exact value of:
(a) cos (60°)
(b) sin (390°)
(c)
 37 
tan  

 4 
1
(a) cos  60   cos 60 
2
3
(b) sin  390    sin 390   sin  30  360    sin 30  
2
 37
(c) tan  
 4

 37


tan



 4

  36 


tan

 

4 

4



  tan   9    tan  1
4
4

Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall.