euclidean space, tangent vector and norm

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Feb 6, 2020, 10:45:06 AM2/6/20

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I would just like to calculate the norm of the vector tangent to a curve of Euclidean space.

I try this:

Capture 1.JPG

with this error message

Capture 2.JPG

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Feb 6, 2020, 10:54:48 AM2/6/20

to sage-support

Excuse me, I forgot the question:

maybe there is simpler, but I do not understand where the error lies.

Thank you in advance for your help

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