The line \( y=2 x+c \) is tangent to the parabola P \( y^{2}=4 x \)...

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The line \( y=2 x+c \) is tangent to the parabola
P \( y^{2}=4 x \), then \( c= \)

W
(1) \( -1 / 2 \)
(2) \( 1 / 2 \)
(3) \( 1 / 3 \)
(4) 4
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