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ANSWER:
Given that,
the vector field obtained on the torus by parametrizing all its meridians by arc length.
Here we need to prove that the vector field obtained on the torus by parametrizing all its meridians by arc length and their tangent vectors are differentiable.
Explicitly,a differentiable vector field W in the torus.
Meridians of parameterized by circular segment length, for all characterize W(p) as the speed vector of the meridian going through p.
x = (R+r tanϕ)cosθ
y = (R+r tanϕ)sinθ
z = r sinϕ
Where θ,ϕ∈[0,2π]
Thus, the vector field obtained on the torus by parametrizing all its meridians by arc length and their tangent vectors are differentiable.
Hence proved.
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