Question: Find the unit tangent vector T(t) at the point with the given value of the parameter t r(t) = < tcos3t, (sint)^3, (cost)^3 > ;

Find the unit tangent vector T(t) at the point with the given value of the parameter t

r(t) =< tcos3t, (sint)^3, (cost)^3 > ; t = /4

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