TRIGONOMETRIA ТРИГОНОМЕТРИЯ И.М. Гельфанд, С. М.Львовский, А.Л.Тоом

IM Gelfand, SM Lviv, AL Toom. Trigonometry Moscow, 2002. - 199 p. ISBN 5-94057-050-X This book, written by a group of authors under the direction  of one of the greatest mathematics of the 20th century academic IM Gelfand, is intended to refute the conventional  about the trigonometry incomprehensible high school  mathematics. The reader is invited to look at familiar the subject in a new way.
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