Yakovlev,G N <br/><br/>
High-school mathematics 

 - Moscow  Mir Publishers  1982 
 - 448p. 
<br/><br/> part two <br/>translated from the Russian by Irene Aleksanova 
<br/><br/><label>Subjects--Index Terms: </label>mathematics  trigonometric equations 
<br/><br/><label>Dewey Class. No.: </label>373.5:51  / YAK