TY  - BOOK
AU  - Bitting,Marvin L.
TI  - Precalculus : : graphs and models : a unit circles approach 
SN  - 0201616750
U1  - 512 
PY  - 2001///
CY  - Boston
PB  - Addison-Wesley
KW  - Algebra
KW  - Graphic methods
ER  -