Question: Let f(x, y) = 1n(cos (x / 3)) - In (cos (y / 3)). (a) Guess whether div F is positive or negative at a

Let f(x, y) = 1n(cos (x / 3)) - In (cos (y / 3)).
(a) Guess whether div F is positive or negative at a few points and then calculate div F to check on your guesses?
(b) Calculate the flux of F across the boundary of S?

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