If the parabola \( y^{2}=4 a x \) passes through the point \( \math...

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If the parabola \( y^{2}=4 a x \) passes through the point
\( \mathrm{P} \) \( (1,-2) \), then the tangent at this point is:

W
(1) \( x+y-1=0 \)
(2) \( x-y-1=0 \)
(3) \( x+y+1=0 \)
(4) \( x-y+1=0 \)
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