P.K. Chaurasya, <br/><br/>
Trigonometry 
By P.K. Chaurasya 
 - 1st ed. 
 - New Delhi:  Campus books international,  2014. 
 - 223p. 
<br/><br/><label>ISBN: </label>9788180303289 
<br/><br/><label>Subjects--Index Terms: </label>Mathematics Trigonometry 
<br/><br/><label>Dewey Class. No.: </label>510