TY  - BOOK
AU  - Yang Desheng
TI  - Trigonometric Functions and Complex Numbers: in Mathematical Olympiad and Competitions
SN  - 9781938134876
PB  - WCPC
KW  - Mathematics
UR  - https://www.worldscientific.com/worldscibooks/10.1142/u028#t=toc
ER  -