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Given the vector function r(t) ( cos3t,sin3t,t) and t=pi/9 , find the following. (a) the curvature...

Given the vector function r(t) ( cos3t,sin3t,t) and t=pi/9 ,

find the following.

(a) the curvature at given t,
(b) the unit tangent vector T at given t

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