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Show that the vector field F(x, y, z) = (3y cos(-9x), -9x sin(3y), 0) is not a gradient vector field by computing its curl. How

Show that the vector field F(x, y, z) = (3y cos(-9x), -9x sin(3y), 0) is not a gradient vector field by computing its curl. How does this show what you intended? curl(F) = V X F =(0.DO>

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