If the bisector of the angles of the lines represented by $3 x^{2} - 4 x y + 5 y^{2} = 0$ and $5 x^{2} + 4 x y + 3 y^{2} = 0$ are same, then the angle made by the lines represented by first with the second, is

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Solution

The correct option is D

Here both the equations are perpendicular to each other.So,under the given condition it is clear that angle is $90^{\circ}$ .

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