If the equation \( x^{2}-y^{2}-2 x+2 y+\lambda=0 \) represents a \(...

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If the equation \( x^{2}-y^{2}-2 x+2 y+\lambda=0 \) represents a
\( \mathrm{P} \) degenerate conic, find the value of \( \lambda \).

W
(1) 0
(2) -1
(3) 1
(4) 2
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