5 Derive the differential equation for the area bounded by the arc of a curve, the x- axis, and the two ordinates, one fixed and one variable, is equal to trice the length of the arc between the ordinates
6 Find the differential equation of all straight lines at a unit distance from the origin
7 Obtain the differential equation associated with the given primitive
lny=Ax^2+B
, A and B being arbitrary constants.
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