Question: Show that the vector field F ( x , y , z ) = ( : 7 y c o s ( 2 x )

Show that the vector field F(x,y,z)=(:7ycos(2x),2xsin(7y),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 ) = ( :

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