If the equation ax^3+3bx^2y+3cxy^2+dy^3=...

If the equation `ax^3+3bx^2y+3cxy^2+dy^3=0 (a,b,c,d ne 0)` represents three coincident lines then

a=c

b=d

`a/b=b/c=c/d`

ac=bd

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