Excuse me, I'm always getting WA in this qq.
So can anyone help me? Or have I misinterpreted the qq??
Should I try to expand (a + dx)^3 and just ignore the dx^2 and dx^3 terms? Or am I wrong? Plz tell!!
Some critical inputs/outputs would be nice too!!
![:D](./images/smilies/icon_biggrin.gif)