Lemma
MediumCurves in space
Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §12.1 The Position Vector, #27 · Multivariable Calculus · Curves in space

Change … so that the speed along the helix … is 1…

Change so that the speed along the helix is 1 instead of . Call the new parameter .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §12.1 The Position Vector, #27

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