TY  - BOOK
AU  - Bittinger, Marvin L.
AU  - Beecher, Judith A. 
AU  -  Ellenbogen,  David.
AU  - Penna, Judith A. 
TI  - Precalculus: graphs and models: A unit circle approach
SN  - 0201616750
AV  - QA 154.2.P725 2000 
PY  - 2000///
CY  - Boston.
PB  - Addison Wesley, 
KW  - Algebra
KW  - Algebra-Graphic methods
KW  - Trigonometry
KW  - Trigonometry-Graphic methods
ER  -