00311nam a2200121Ia 45000030006000000080041000060400015000471000042000622450031001042600025001355460012001600050017001720STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aNarayanan, S.; Manicavachagom, P.T.K.  aSupplement to Trigonometry  bS. Viswanathanc1971  aEnglish20220125170006.0