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III. Find the differential equation of the family of curves. (5pts. each) 1. xcos(xy)+ e In y =c 2. ax + by =1 3.

III. Find the differential equation of the family of curves. (5pts. each) 1. xcos(xy)+ e" In y =c 2. ax + by =1 3. All parabolas with axis perpendicular to x-axis and the distance between focus and vertex is c.

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