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Calculus in 3D Section 1.3 video 2/4: Tangent vector
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00:00 -- Tangent vector definition (it's just the unit velocity vector!!)
05:58 -- Example: tangent vector for a straight line
09:44 -- Example: tangent vector for a circle
05:58 -- Example: tangent vector for a straight line
09:44 -- Example: tangent vector for a circle
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