Gabuyo, Yonardo A. <br/><br/>
Plane trigonometry : a modern approach 

 - 2nd ed. 
 - Manila    Rex book Store   2011 
 - ix, 323 p. 
<br/><br/><label>ISBN: </label>978-971-23-6132-6 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry
<br/><br/><label>Dewey Class. No.: </label>Fil 516.24 G11p