(3/sqrt(14), 2/sqrt(14), -1/sqrt(14))

(3/sqrt(14), sqrt(2/7), -1/sqrt(14))

1

r = 1 (radius), θ = cos^(-1)(-1/sqrt(14)) (polar angle), ϕ = tan^(-1)(2/3) (azimuthal angle)

x = (3 t)/sqrt(14), y = sqrt(2/7) t, z = -t/sqrt(14) for 0<=t<=1