Baltazar, Ethel Cecille M. <br/><br/>
Plane and spherical trigonometry :  text/workbook / 
Ethel Cecille M. Baltazar, Ana Liza  M. Dy, Melvin A. Vidar. 
 - Quezon City :  C & E Publishing, Inc,  c2014. 
 - ix, 257 pages :  illustration ;  26 cm. 
<br/><br/> Includes bibliographical references. 
<br/><br/><label>ISBN: </label>9789719801641 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry--Problems, exercises, etc.<br/>Trigonometry--Textbooks.