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Pal, B. K         Engineering mathematics : for 1st year 2nd semester / B. K. Pal ; K. Das . – 9th ed. . – Kolkata : U. N. Dhar, 2017         v.2; 532p.         ISBN9789380673844 : 274/-         1. Mathematics – Engneering         1. Engneering – Mathematics         I. Das, K, Author