Das, B.C. . <br/><br/>
Higher Trigonometry /  Textual Documents 
B.C.Das,B.N.Mukherjee. 
 - 28th ed. / 
 - Calcutta :  U. N. Dhur & Sons Pvt. Ltd. ,  1998. 
 - 311p. :  ill ;  18cm . 
<br/><br/>Index 
<br/><br/><label>ISBN: </label>81-85624-69-0 
<br/><br/><label>Subjects--Index Terms: </label>Mathematics Trigonometry G-Mathematics 
<br/><br/><label>Dewey Class. No.: </label>516.24  / Da 26 Hi