TY  - BOOK
AU  - Dugopolski,Mark
TI  - Precalculus : : functions and graphs / 
SN  - 032150111X   
PY  - 2009///
CY  - Boston
PB  - Pearson Education, 
KW  - Functions
KW  - Textbooks
KW  - Mathematics
KW  - Graphic methods
ER  -