You need to find the directional derivative of the functian f(x,y) = tan" (x4) at the point (2,2) in tue direction of the unit vector o para llel to the vector V= 4i +2j. Don't estimate, round, or have decimals your in DnBwer.

Find the directional derivative Duf(1, 1), where f(x, y) = x2 + y2 and u is the unit vector at an angle of π/6 from horizontal.

Let r(t) =< 3t, 5t^2, 2t >. Find the unit tangent vector T(t).

Let u(t) = 2t'i+ (P -7)j-8k and v(t) = e'i+3 ej- ek. Compute the derivative of the following function. 3t L u(t) • v(t) Select the correct choice below and fill in the answer box(es) to complete your choice. O A. The derivative is the scalar function 訓 這 O B. The derivative is the vector-valued function (i+ (Dj+ ( k.