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2xy + 2x and N (x, y) = (x2 y) show that My(x, y) (b) For the functions M(x, y) N(x, y) = 0.

2xy + 2x and N (x, y) = (x2 y) show that My(x, y) (b) For the functions M(x, y) N(x, y) = 0. .

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