(1 point) Suppose ( f(x, y)= frac{3}{x^{2}+y^{2}} ) and ( boldsymbol{u} ) is the unit vector in the direction of ( langle-2,-3 rangle ). Then, (a) ( nabla f(x, y)= ) (b) ( nabla f(4,2)= ) (c) ( f_{u}(4,2)=D_{u} f(4,2)= )

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(1 point) Suppose  ( f(x, y)= frac{3}{x^{2}+y^{2}}  ) and  (  boldsymbol{u}  ) is the unit vector in the direction of  (  langle-2,-3 rangle  ). Then, (a)  (  nabla f(x, y)=  ) (b)  (  nabla f(4,2)=  ) (c)  ( f_{u}(4,2)=D_{u} f(4,2)=  )

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(Solved): (1 point) Suppose \( f(x, y)=\frac{3}{x^{2}+y^{2}} \) and \( \boldsymbol{u} \) is the unit vector ...

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