Find the directional derivative of $f ( x , y ) = x ^ { 3 } + x y ^ { 2 }$ at the point $( 1 , - 2 )$ in the direction toward the origin.

Name: Find the directional derivative of $f ( x , y ) = x ^ { 3 } + x y ^ { 2 }$ at the point $( 1 , - 2 )$ in the direction toward the origin.
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The Answer of Find the directional derivative of $f ( x , y ) = x ^ { 3 } + x y ^ { 2 }$ at the point $( 1 , - 2 )$ in the direction toward the origin.

Find the Directional Derivative Of f(x,y)=x3+xy2f ( x , y ) = x ^ { 3 } + x y ^ { 2 }f(x,y)=x3+xy2

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