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sqrt(14)
(3/sqrt(14), 2/sqrt(14), -1/sqrt(14))
(3/sqrt(14), sqrt(2/7), -1/sqrt(14))
r = sqrt(14) (radius), θ = cos^(-1)(-1/sqrt(14)) (polar angle), ϕ = tan^(-1)(2/3) (azimuthal angle)
x = 3 t, y = 2 t, z = -t for 0<=t<=1
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