Yaar, i think dere mst hve bn a prntng mstk. A relatn b/n a,b,c hs 2 b dere. In analogy 2 ur prob., i cn shw u smthng 2 mke u clr. Lts c---------------tek ds as an example in acc. 2 ur problm.
, be the roots f eqn.ax2 + bx +c=0 ln[a(1+ b/a x +c/a x2)], let d whole expn. Insde bracket b 'E.'