Prove that if two of the lines represented by \( a x^{4}+b x^{3} y+...

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Prove that if two of the lines represented by \( a x^{4}+b x^{3} y+c x^{2} y^{2}+d x y^{3}+a y^{4}=0 \)
\( \mathrm{P} \)
bisects the angle between the other two, then
W \( c+6 a=0 \) and \( b+d=0 \).
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