00321nam a2200133Ia 45000030006000000080041000060400015000471000042000622450017001042500012001212600025001335460012001580050017001700STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aNarayanan, S.; Manicavachagom, P.T.K.  aTrigonometry  aSeventh  bS. Viswanathanc1980  aEnglish20220125170007.0