Foerster, Paul A. <br/><br/>
Trigonometry :  functions and applications / 
Paul A. Foerster. 
 - 3rd ed. 
 - Menlo Park, Calif. :  Addison-Wesley Pub. Co.,  1990 
 - 463 p. :  ill. ;  25 cm. 
<br/><br/><label>ISBN: </label>0201251094  9780201251098 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry--Problems, exercises, etc.
<br/><br/><label>Subjects--Index Terms: </label>Hình học Lượng giác 
<br/><br/><label>Dewey Class. No.: </label>516.24