Helix With Unit Tangent Vector

m = 1.2 (slider from -10 to 10, step 0.1)
h(t) = t
g(t) = cos(t)
f(t) = sin(t)
r = CurveCartesian((f(t), g(t), h(t)), t, -10, 10)
T_{1} = CurveCartesian(r'(t) / abs(r'(t)), t, -20, 20)
A: T_{1}(m)
T: r(m)
u = Vector(T, T + A)