Yeo Ning Hong <br/><br/>
Trig Or Treat: an Encyclopedia of Trigonometric Identity Proofs Tips with Intellectually Challenging Games 

 -  World Scientific  WSPC  2007 
<br/><br/><label>ISBN: </label>9789812776204 
<br/><br/><label>Source: </label>EBOOK 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics