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Which of the following vector fields are conservative? (i)  F(x, y)  =  (7x6y6 + 3) i  ...

Which of the following vector fields are conservative?

(i)  F(x, y)  =  (7x6y6 + 3) i  +  (6x7y5 + 7) j
(ii)  F(x, y)  =  (6ye6x + sin 3y) i  +  (e6x + 3x cos 3y) j
(iii)  F(x, y)  =  7y2e7xy i  +  (7 + xy) e7xy j
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