2.31 Let A and B be vector functions of position vector x with continuous first and second derivatives, and let F and G be scalar functions of position x with continuous first and second derivatives. Show that: (a) V. (V x A) = 0. (b) ▼x (VF) = 0. (c) V (VF x VG) = 0. (d) V. (FA) = A·VF+ FV.A.

Please help me :)

Find the directional derivative of the function at the given point in the direction of vector v. f(x, y) = 3 + 6x√y, (3, 4), v=(4, -3) D₁f(3, 4) = 6 X

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.