Lumabas, Rogelio S. <br/><br/>Plane trigonometry  / Rogelio S. Lumabas.--  -- Quezon City:  Phoenix Pub.,  1993. <br/>vii, 282 p. ;  19 cm.  <br/><br/> Includes index.  <br/><br/><label>ISBN: </label>9710616870 <br/><br/><label>Subjects--Topical Terms: </label><br/>Plane trigonometry--Problems, exercises, etc. <br/><br/><label>Dewey Class. No.: </label>Fil 516.24 L97 1993