Calingasan, Recto Rex M. <br/><br/>
Trigonometry: a worktext / 
Recto Rex M. Calingasan. 
 - Mandaluyong City :  Anvil Publishing, Inc,  c2013. 
 - viii, 209 pages :  illustrations ;  25 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry--Textbooks.