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a) Determine whether the given differential equation is exact. If it is exact, solve it. (If...

a) Determine whether the given differential equation is exact. If it is exact, solve it. (If it is not exact, enter NOT.)

(2xy2 − 5) dx + (2x2y + 4) dy = 0

b) Solve the given differential equation by finding, as in Example 4 of Section 2.4, an appropriate integrating factor.

(6 − 20y + e−5x) dx − 4 dy = 0

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