Find the directional derivative of the function at the point P(2,1) in the following direction:  f(x,y) = 3x2y-2xy2+y3-9 In the direction v->=3i-> - 5j-> a) Duf(2,1) =-5 b) Duf(2,1)= - sqrt(13)/13   c) Duf(2,1) = -1  d) Duf(2,1)= -(5sqrt(34))/34

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