PANCHISHKIN, A. <br/><br/>
Trigonometric function   Problem solving approach 
A. PANCHISHKIN 
 - Moscow  Mir  1988 
 - 172p. 
<br/><br/><label>ISBN: </label>5030002227 
<br/><br/><label>Dewey Class. No.: </label>516.24 P191T