Varberg, Dale E. <br/><br/>
Precalculus :  a graphing approach / 
Dale Varberg and Thomas D. Varberg. 
 - N. J. :  Prentice Hall,  c1995. 
 - xiv, 514 pages :   illustrations ;   24 cm 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0130107034 
<br/><br/><label>LC Class. No.: </label>QA331.3   / V42 1995