Calingasan, Recto Rex M. <br/><br/>
Trigonometry: a worktext / 
Recto Rex M. Calingasan. 
 - vii, 208 pages :  ill. ;  26 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>978-971-27-2781-8 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry.