7. Let f(t) be a smooth curve such that f'(t) #0 for all t. Then we can define the unit tangent vector T by Show that T(t)=- ||f'(t)||* f'(t) × (f"(t) = f'(t)) ||f'(t) || ³ T'(t) = -

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A: Equation of the tangent line

Q: derivative

A: We will find the derivative.

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A:

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A: