If two lines represented by \( x^{4}+x^{3} y+c x^{2} y^{2}-x y^{3}+...

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If two lines represented by \( x^{4}+x^{3} y+c x^{2} y^{2}-x y^{3}+y^{4}=0 \)
P bisect the angle between the other two, then the value of \( c \)

W. is
(1) 0
(2) -1
(3) 1
(4) -6
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