103 trigonometry problemsde Titu AndreescuMateriasProblems, exercisesTrigonometryGeometryMathematicsAlgebraEdiciones (1)103 Trigonometry Problems (2004)Birkhäuser Boston · inglés · ISBN 9780817643348Más obras de Titu Andreescu102 combinatorial problems2003Problems from the bookMathematical Olympiad treasures