The curve described parametrically by \( x=t^{2}+t+1, y=t^{2}-t+1 \...

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The curve described parametrically by \( x=t^{2}+t+1, y=t^{2}-t+1 \) represents \( \quad(1999,2 \mathrm{M}) \)
P
(a) a pair of straight lines
(b) an ellipse
W
(c) a parabola
(d) a hyperbola
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