The straight-line \( y=2 x+c \) is a tangent to the ellipse \( \mat...

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The straight-line \( y=2 x+c \) is a tangent to the ellipse
\( \mathrm{P}^{122} \) \( \frac{x^{2}}{8}+\frac{y^{2}}{4}=1, c= \)

W
(1) \pm 4
(2) \pm 6
(3) \pm 1
(4) \pm 8
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