Drooyan, Irving <br/><br/>
Essentials of trigonometry 
Irving Drooyan, Walter Hadel, Charles C. Carico 
 - 2d ed 
 - New York  Macmillan  1977 
 - viii, 328 p ill 25 cm 
<br/><br/> 'A portion of this material has been adapted from Trigonometry: an analytical approach.'  Includes index 
<br/><br/><label>ISBN: </label>0023302208 
<br/><br/><label>LCCN: </label>75-30627 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry, Plane