Trigonometry / 
Lial, Margaret [et al...]. 
 - 10th ed. 
 - xiv, 297p.  24 cm. 
<br/><br/><label>ISBN: </label>9716840411 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry--c1987--San Juan Metro Manila: Philippines--newspaper