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When I derive dθ/ds I get the curvature k of a curve. But exist too the torsion τ of a curve and I think that exist some angle that when derivate wrt arc length s results in the torsion τ. So, is possible to define such angle?

http://mathworld.wolfram.com/TangentialAngle.html

http://mathworld.wolfram.com/FrenetFormulas.html

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# 2nd tangential angle and torsion

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