Question: Let f ( x , y , z ) = s i n ( x y + z ) , P = ( 0 ,

Let f(x,y,z)=sin(xy+z),P=(0,-1,) and Q=(1,-1,1).
a) Calculate the directional derivative of f at P in the direction of the vector making an angle 23 with gradf(P).
b) What is the unit normal vector of this surface at Q?
Let f ( x , y , z ) = s i n ( x y + z ) , P = ( 0

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