00341nam a22001217a 4500020001800000082001700018100001700035245007100052260003300123300002000156650002600176700001700202  a9788120324428  a515.3bAHS/T  aAhsan Akhtar  aTextbook of differential calculus/ cAhsan Akhtar and Sabiha Ahsan  aDelhi:bPHI learning,c2004.  a518p. ; b25cm.  aDifferential Calculus  aSabiha Ahsan