Question

which of the following is a parabolic cylinder in space? x2-y2=1, X2+y2=1, y=4x, y2=4x
${x}^{2} - {y}^{2} = 1 \\ {x}^{2} + {y}^{2} = 1 \\ y = 4x \\ {y}^{2} = 4x$
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Answer 1

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