Question: ( a ) Find the directions in which the directional derivative of f ( x , y ) = x ^ ( 2 ) +

(a) Find the directions in which the directional derivative of f(x,y)=x^(2)+xy^(3) at the point (2,1) has value 2.(b) Find the equations of tangent plane and normal line to the given surface at the given point: xy^(2)z^(3)=8,(2,2,1)
( a ) Find the directions in which the

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