Gabuyo, Yonardo  A.  4  0   <br/><br/>
Plane trigonometry :  a modern approach      6 
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Yonardo A. Gabuyo and  Leila D.P. Mejia. 
 - second edition   
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 - ix, 324 pages  illustrations.   26 cm.     
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<br/><br/>   Includes bibliographic records and index 
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