pi             3.141593
            x1             0.000000 x2             3.141593             no            16.000000
                                    dx             0.196350
   0.000000    0.000000
   0.196350    0.195090
   0.392699    0.382683
   0.589049    0.555570
   0.785398    0.707107
   0.981748    0.831470
   1.178097    0.923880
   1.374447    0.980785
   1.570796    1.000000
   1.767146    0.980785
   1.963495    0.923880
   2.159845    0.831470
   2.356194    0.707107
   2.552544    0.555570
   2.748894    0.382683
   2.945243    0.195090
   3.141593    0.000000