Plane trigonometry - Hagos, Luisito. 4 0 16; Ymas, Sergio E.;Agalabia, Carmelita E.; 5 (Manila, Phillippines:;Manila, Philippines : Feliber Publishing House,;Feliber Publishing House, 1998)
Keywords: 2 -- 0; 6; Plane trigonometry; 20; 2