                          a                   b
0                       NaN                 NaN
1        0.7071067811865476  7.0710678118654755
2        0.9896727008433244   4.570602909781608
3        1.2570234177936443    6.46280105628986
4        1.5063312890944265   7.796079761864132

[5 rows x 2 columns]