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Orthogonal trajectories of the family of...

Orthogonal trajectories of the family of curves represented by `x^2+2y^2-y+c=0` is (A) `y^2=a(4x-1)` (B) `y^2=a(4x^2-1)` (C) `x^2=a(4y-1)` (D) `x^2=a(4y^2-1)`

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