TY  - BOOK
AU  - Cohen, David,
TI  - Precalculus with-Unit-Circle trignometry
SN  - 0314710159
U1  - 512.1 
PY  - 1990///
CY  - St. Paul
PB  - West Publishing
KW  - Functions
KW  - Algebra
KW  - Trigonametry
N1  - includes index
ER  -