Drooyan, Irving. <br/><br/>
Trigonometry :   an analytic approach / 
Irving Drooyan and Walter Hadel. 
 - London :   Macmillan,   c 1967. 
 - x, 400 p. :  ill. ;  24 cm. 
<br/><br/> Includes index. 
<br/><br/>310  310 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry--Polygonometrie (Geometrie)
<br/><br/><label>Dewey Class. No.: </label>514 / D834t