00259nam a2200109Ia 4500008004100000082001500041100001600056245001700072250000900089260004300098300000800141240913s9999||||xx |||||||||||||| ||und||  a510  NAR/T  aS Narayanan 0aTrigonometry  aNULL  bS Viswanathan PublishersaMadrasc2007  a195