Drooyan, Irving <br/><br/>
Essentials of trigonometry / 
Irving Drooyan, Walter Hadel, Charles C. Carico. 
 - 4th ed. 
 - New York :  Macmillan Publishing,  c1986. 
 - xi, 367 p. :  ill. ;  25 cm. 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>0023305703 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plane trigonometry.
<br/><br/><label>LC Class. No.: </label>QA 53 D76 1986 CIRC