Ratti, J. S. <br/><br/>
Trigonometry / 

 - Boston   Addison-Wesley,  2010. 
 - xxii, 430 p. :  ill. (col.) ;  29 cm. 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>0321567986 9780321567987 0321565061 9780321565068  
<br/><br/><label>LC Class. No.: </label>QA531  / .R19 2010