Question: . ( 8 points ) . Find the directional derivatives of f ( x , y , z ) = 5 x 3 + 8

.(8 points). Find the directional derivatives of f(x,y,z)=5x3+8y2-12z3 at (-1,2,-3) in the direction of vec(v)=(:4,-2,-1:).
. ( 8 points ) . Find the directional derivatives

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