1. [-/25 Points] DETAILS MY NOTES PRACTICE ANOTHER Find the derivative, r'(t), of the vector function. r(t) = (t sin(3t), t2, t cos(4t)) r' (t ) = (1) Need Help? Watch It Master It Viewing Saved Work Revert to Last Response Submit Answer 2. [-/25 Points] DETAILS MY NOTES PRACTICE ANOTHER Find the unit tangent vector T(t) at the point with the given value of the parameter t. r(t) = (4te-t, 2 arctan(t), 4el), t = 0 T(0) = Need Help? Watch It Master It 3. [-/25 Points] DETAILS MY NOTES PRACTICE ANOTHER Find r(t) if r'(t) = 3 i + et j + 4te4t k and r(0) = i + j + k. r(t) =