3. [-/1 Points] DETAILS SCALCET9 13.2.009. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Find the derivative, r'(t), of the vector function. r(t) = (vt - 6, 5, 4 r (t) = Need Help? Read It 4. [0/1 Points] DETAILS PREVIOUS ANSWERS SCALCET9 13.2.014. MY NOTES ASK YOUR TEACHER Find the derivative, r'(t), of the vector function. r(t) = cos2(at) i + tebtj + sin2(ct) k r (t) = 2 acos at cos ati + e"( 1 + bt)j - 2c cos ct cos ctk X Need Help? Read It