http://sphotos-h.ak.fbcdn.net/hphotos-ak-ash4/485580_10200547582988715_854455727_n.jpg [Broken] In formula 1 it says F(1) = F(0)+F'(0)+ 0.5F''(C) Where the heck dos the C come from? I thought they were applying taylor's formula to find an approximation of F(1), around t=0. Then c=0, right? Is it because h and k are very small? In other words, how is there room for a c, when x=1 and x0=0?