Trigonometry  / 
Lial Margaret [et..al] 
 - 10th ed 
 - Boston :  Pearson ,  2013. 
 - xx,453 p,:  ill.; 
<br/><br/><label>ISBN: </label>0321671776 
<br/><br/><label>LC Class. No.: </label>QA531  / .L52  2013