Test each of the following differentials for exactness. (a) du = y/1+x 2 dx tan 1
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Test each of the following differentials for exactness.
(a) du = y/1+x2 dx − tan−1 (x)dy,
(b) du = (x2 + 2x + 1)dx + (y2 + 5y + 4)dy.
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