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Find the Directional Derivative Of $f ( x , y ) = x ^ { 3 } y + 5 x y ^ { 2 }$

Question 106

Essay

Find the directional derivative of $f ( x , y ) = x ^ { 3 } y + 5 x y ^ { 2 }$ at the point (1, 1)in the direction of $3 \vec { i } + 5 \vec { j }$ .

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