Trigonometry: a worktext 
Calingasan, Recto Rex M. 
 -  Anvil Publishing Inc.  2013 
 - vii, 208 pages 
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<br/><br/><label>ISBN: </label>978-9-71272781-8 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry.
<br/><br/><label>Dewey Class. No.: </label>F 516.24 C154 2013