Nilmini Adeydeera <br/><br/>
Trigonometry 
Nilmini Adeydeera 
 - First Edition 
 - Sri Lanka,Colombo  Samudra Book Publications  2019 
 - 197p. 
<br/><br/><label>ISBN: </label>978 955 680 850 6 
<br/><br/><label>Dewey Class. No.: </label>11054  / Nil