(3) Consider the differential equation (x + sin y) dx + (x cos y – 2y) dy = 0 : COS (a) Determine whether the above equation is exact. (b) If the equation is not exact, find an integrating factor. If the equation is exact, skip this step and go on to (c). (c) Solve the equation using the method of exact solutions, using the integrating factor from (b) if necessary.

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