1.

The subnormal at any point of a curve is of constant length '8'. Then the differential equation of the family of curve is

Answer»

`(dy)/(DX) = 8y`
`y (dy)/(dx) = 8`
`y SQRT(1 + ((dy)/(dx))^(2)) = 8`
`y sqrt(1 + ((dy)/(dx))^(2)) = 8 (dy)/(dx)`

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