例 COSX=X 构造序列x,=1,xn+1=COS, x=0.739085133.… x=0.73909/y=x (0.54,0.86) (0.86,0.65) (0.54,0.54) y=cosx x0=1 2 COORDINATES ROUNDED例 cos x x  0 1 1, cos , , 0.739085133 n n x x x x       构造序列