Drooyan, Irving <br/><br/>
Essentials of trigonometry /  
Irving Drooyan, Walter Hadel, and Charles C. Carico 
 - New YorK :   Macmillan ;  London :   Collier,   1971 
 - ix, 336 p. :   gráf., il. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MATEMATICAS<br/>GEOMETRIA<br/>TRIGONOMETRIA<br/>LOGARITMOS
<br/><br/><label>Universal Decimal Class. No.: </label>514