TY  - BOOK
AU  - Mangene,Ubaldo P.,Jr
TI  - Trigonometry: worktext 
SN  - 9789710141432
PY  - 2012///
CY  - Plaridel, Bulacan
PB  - St. Andrew Publishing House
KW  - Trigonometry
KW  - sears
N1  - Includes bibliographical references (p.171)
ER  -