In what direction from the point (1,-1) is the instantaneous rate of change of f(x.y) = 8x* – 10x?y? - 11y° equal - 13? There are two unit vectors : u = (0,1) , and v = (, ) = (0.0

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A: According to question given thatf(x,y)=8x4-10x2y2-11y3

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