Plane and spherical trigonometry - Sarmiento, Agnes Cenen E.; Calilung, Joseph M.; Sadac, Grace C.; Sales, Valentino S.; Lingat, Nelson G.; Limin, Antoni Valer R.; Chavez, Michael M.; Guzman, Danilo M., Jr. (Mandaluyong City: Books Atbp. Publishing Corp., 2009)
Includes bibliographical references .
Keywords: Trigonometry