(1 point) Given R(t) - 2ti + t2j + 4k Find the derivative R.'(t) and norm of the derivative. R' (t) = IR' (t)II = Then find the unit tangent vector T(t) and the principal unit normal vector N(t) T(t) = N(t) =(1 point) Given R(t) - ent cos(31) 2 + est sin(31) 3 + 3ek Find the derivative R. (t) and norm of the derivative. R' (t) IR' (t) |1 = Then find the unit tangent vector T(t) and the principal unit normal vector N(t) T(t) = N(t) =