Question: f ( x , y , z ) = c o s ( 3 x + 2 y + z ) that Q 3 -

f(x,y,z)=cos(3x+2y+z) that
Q3- Find the rate of change of the function f(x,y)=2xy2-7yx3 at the point
(1,1) in the direction of the vector i-j.
f ( x , y , z ) = c o s ( 3 x + 2 y + z ) that Q

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