TY  - BOOK
AU  - Baltazar, Ethel Cecille M.
AU  - Dy, Ana Liza M.
AU  - Vidar, Melvin A.
TI  - Plane and spherical trigonometry: text/workbook 
SN  - 9789719801641
AV  - QA531 .B216 2014
PY  - 2014///
CY  - Quezon City
PB  - C&E Publishing
KW  - Trigonometry
KW  - Textbook
KW  - Problems, exercises, etc
ER  -