The tangents at the points \( A(1,3) \) and \( S(1,-1) \) on the parabola \( y^{2}-2 x-2 y=1 \) ...

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The tangents at the points \( A(1,3) \) and \( S(1,-1) \) on the parabola \( y^{2}-2 x-2 y=1 \) meet at the point \( P \). Then the area (in unit \( { }^{2} \) ) of the triangle \( P A B \) is:
(a) 4
(b) 6
(c) 7
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