An equation of a tangent common to the parabolas \( y^{2}=4 x \) an...

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An equation of a tangent common to the parabolas \( y^{2}=4 x \) and \( x^{2}=4 y \) is
(a) \( x-y+1=0 \)
(b) \( x+y-1=0 \)
(c) \( x+y+1=0 \)
(d) \( y=0 \)
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