+1x+o(x)2+242(x+h-x)I+0+Imo(x2)+01+En x+h(1-x)→0x→02xx→02(x-12Fo cosx-e 2mnosx-8sn FeFo2+h(1-x)2E sin x-3xe2+xe+二m(3-x2)e+◎Ve看泰勒公式12126