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find the directional derivative of f(x,y,z) = xy^2+yz^3 at P(2,-1,1) in the direction perpendicular to the surface xlog=-y^2 = -4 at Q(-1,2,1)
find the directional derivative of f(x,y,z) = xy^2+yz^3 at P(2,-1,1) in the direction perpendicular to the surface xlog=-y^2 = -4 at Q(-1,2,1)
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