Prove that the lines \( 2 x^{2}+6 x y+y^{2}=0 \) are equally inclin...

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Prove that the lines \( 2 x^{2}+6 x y+y^{2}=0 \) are equally inclined to the lines \( 4 x^{2}+18 x y+y^{2}=0 \).
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