(Solved): I need to help on question 33. I will give you a thumbs up if you get it correct. There is nothing t ...

I need to help on question 33. I will give you a thumbs up if you get it correct. There is nothing to do with the graph. The question 33 wants you to refer to question 31. 

 

 

+ yº cos z, then VX(Vf)=0. 33. Let F = = yzi+xzj + xy k. Find Di-j+k)/3F(3, 2, 1). 3+ 1 2 (V33, 4/33, -13) 31. (a) In analogy with the directional derivative of a scalar-valued function defined, show that D, F(a) = pra+ d F(a + dt 1=0 (b) Use the result of part (a) and the chain rule to show that, if F is differentiable at a, then D F(a) = DF(a), where v is interpreted to be an n x 1 matrix. (Note that this result makes it straightforward to calcu- late directional derivatives of vector fields.)