TY  - BOOK
AU  - Yang, Desheng
AU  - 
ED  - 
ED  - 
ED  - 
TI  - Trigonometric functions and complex numbers
T2  - World century mathematical olympiad series 
SN  - 9781938134869
U1  - 516.246 
PY  - 2017///
CY  - New Jersey
PB  - World Century
KW  - 
ER  -