There is nothing which is not already said.<br><br>I want point out few things  for some one living in the cave and trying to learn physics/math.<br><br>1-1980 edition is only 15$ so don't shy away buy this book.<br><br>2-Having no help(teachers/school) there is chance you would get stuck once or twice a chapter. USE "Calculs for complete idiot idots". complete idiots guide would help you in series, partial differentials, multiple integrals.<br><br>3-Calculs of variation(chapter 9) if you need help, look for it on wiki for the Lagrangian/euler.<br><br>If I think of any thing else I would post here.