please answer this qustion corrctly thanks Find the unit tangent vector \( T(t) \) at the point with the given value of the parameter \( t . \) \[ r(t)=\cos (t) \mathbf{1}+5 t \mathbf{j}+4 \sin (3 t) \mathbf{k}, \quad t=0 \] \( T(0)=\frac{5}{1 2 answers