• # question_answer If the bisectors of the angles of the lines represented by $3{{x}^{2}}-4xy+5{{y}^{2}}=0$ and $5{{x}^{2}}+4xy+3{{y}^{2}}=0$ are same, then the angle made by the lines represented by first with the second, is A)            ${{30}^{o}}$                        B)            ${{60}^{o}}$ C)            ${{45}^{o}}$                        D)            ${{90}^{o}}$

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