00408nam a2200169 a 450000500170000002000180001708200160003510000160005110000250006724500200009226000490011230000270016160000080018863000300019685600060022685600060023220251203114911.0  a9788187156161  a516.24bNAR  aNarayanan,S  aManicavachagom, T.K.  aTrigonometryb_  aChennaibS.Viswanathan Private Limitedc2012  av, 195 p .c20 cm.bPB  bc_  aMathematics- Trigonometry  f_  a_