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The differential equation of all non-hor...

The differential equation of all non-horizontal lines in a plane is given by
(i) `(d^(2)y)/(dx^(2))=0` (ii) `(d^(2)x)/(dy^(2))=0` (iii) `(d^(2)y)/(dx^(2))=0 and (d^(2)y)/(dy^(2))=0 ` (iv) All of these

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