Question: A . f ( x , y ) = - ( 4 x 3 + 9 y 3 ) gradf ( x , y )

A.f(x,y)=-(4x3+9y3)
gradf(x,y)=
B.f(x,y)=-4x3y3
gradf(x,y)=
C.f(x,y,z)=-(4x3+9y3+6z2)
gradf(x,y,z)=
D.f(x,y,z)=-4x3y3z2
gradf(x,y,z)=
E.f(x,y)=cos3(-4x)+sin3(-9y)
gradf(x,y)=
 A.f(x,y)=-(4x3+9y3) gradf(x,y)= B.f(x,y)=-4x3y3 gradf(x,y)= C.f(x,y,z)=-(4x3+9y3+6z2) gradf(x,y,z)= D.f(x,y,z)=-4x3y3z2 gradf(x,y,z)= E.f(x,y)=cos3(-4x)+sin3(-9y) gradf(x,y)=

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