Question: Show that the vector field F ( x , y , z ) = ( 8 y c o s ( - 9 x )

Show that the vector field F(x,y,z)=(8ycos(-9x),-9xsin(8y),0) is not a gradient vector field by computing its curl. How does this show what you intended?
curl(F)=gradF=
).
Show that the vector field F ( x , y , z ) = ( 8

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