00397nam a2200121Ia 450000500170000000800410001708200160005810000580007424500560013226000270018830000250021565000350024020240821160553.0240821s9999||||xx |||||||||||||| ||und||  a510 NAT(TB)  aNational Council of Educational Research and Training 0aTextbook of mathematics for classes XI-XII: book IV  aNew DelhibNCERTc1978  abook IV (xii, 143-41  aMathematics - Textbook - NCERT