Downing, Douglas <br/><br/>
Trigonometry the easy way 
Douglas Downing 
 - New York  Barron's Educational Series, Inc.  1990 
 - ix,310p.  28cm. 
<br/><br/>Includes index 
<br/><br/><label>ISBN: </label>0812043899 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry
<br/><br/><label>LC Class. No.: </label>MATH QA531.D683