# Unit tangent and unit normal vectors.

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Given the vector r(t) = t i + t^2 j find T(t), T(1) a dn then N (1).

After this I am to sketch the plane curve and graph the vectors T(1) and N(1) at t = 1.

https://brainmass.com/math/vector-calculus/unit-tangent-unit-normal-vectors-69929

#### Solution Preview

Solution:

r(t) = t i + t^2 j

First we find the unit tangent vector

T(t) = (i+2tj)/ sqrt(1+4t^2)

Now use the quotient rule to find T '(t)

T'(t) = (1+4t^2)^1/2 (2j) - (i+2tj) 4t (1+4t^2)^ -1/2

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#### Solution Summary

Unit tangent and unit normal vectors are investigated. The solution is detailed and well presented.

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