If two tangents drawn from a point \( P \) to the parabola
\( \math...
If two tangents drawn from a point \( P \) to the parabola
\( \mathrm{P} \) \( y^{2}=4 x \) are at right angles, then the locus of \( P \) is:
W
(1) \( 2 x+1=0 \)
(2) \( x=-1 \)
(3) \( 2 x-1=0 \)
(4) \( x=1 \)
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