Earl W. Swokowski <br/><br/>
Fundamentals of trigonometry 

 - Seventh Edition 
 - Boston  PES Kent publishing company  1981 
 - 355 p 
<br/><br/><label>ISBN: </label>0-534-91730-5 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry plane
<br/><br/><label>LC Class. No.: </label>QA 533 .S95/