Question: suppose f ( x , y , z ) = x / y + y / z , P = ( 3 , 3 ,

suppose f(x,y,z)= x/y+y/z, P=(3,3,4) the gradient of f is 1/y i -x/y^2+1/z j -y/z^2 k, and What is the maximum rate of change of f at the point P?

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