Introduction to Calculus with Derivatives
If one wants to learn calculus, I can't recommend Silvanus P. Thompson's <i>Calculus Made Easy</i> enough.<p>It's one of those old (1920's, IIRC) books that gets right down to brass tax, and doesn't clutter your understanding with useless fluff designed to make learning maths "fun".  These kinds of books are all too rare.