103 trigonometry problems :
Andreescu, Titu, 1956-
103 trigonometry problems : from the training of the USA IMO team / One hundred three trigonometry problems Titu Andreescu, Zuming Feng. - Birkh
103 trigonometry problems : from the training of the USA IMO team / One hundred three trigonometry problems Titu Andreescu, Zuming Feng. - Birkh