Equation Icon  { [ ] } r = s 1 + 1-saa(t)ωa − 1s2 aa(t)ωa 2 − 1s2a˙0(t) − 1s2a˙a(t)ωa + 1-s2Ra0b0(t)ωa ωb + O(s3) (11.5 ) 2 8 8 3 6