Das, B.C. . <br/><br/>
Higher Trigonometry /  Textual Documents 
B.C.Das,B.N.Mukherjee. 
 - 22nd ed. / 
 - Calcutta :  U. N. Dhur & Sons Pvt. Ltd. ,  1984. 
 - 288p. :  ill ;  18cm . 
<br/><br/><label>Subjects--Index Terms: </label>Trigonometry G-Mathematics 
<br/><br/><label>Dewey Class. No.: </label>516.34