Yang, Desheng <br/><br/>
Trigonometric functions and complex numbers   
by Desheng Yang 
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 - New Jersey  World Century  2017 
 - x, 411p.  
 - World century mathematical olympiad series    vol.1 .
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<br/><br/><label>ISBN: </label>9781938134869 
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<br/><br/><label>Dewey Class. No.: </label>516.246  / Y21.TF