Andreescu, Titu . 103 trigonometry problems : from the training of the USA IMO team / by Titu Andreescu and Zuming Feng. - New Delhi : Springer (India) Pvt. Ltd. , 2009 - xii, 214p : ISBN: 978-81-8128-339-9 Subjects--Topical Terms: Trigonometry- Problems, exercises, etc Dewey Class. No.: B5 / P9