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The curve described parametrically by x=...

The curve described parametrically by `x=t^2+t+1` , and `y=t^2-t+1` represents. (a) a pair of straight lines (b) an ellipse (c) a parabola (d) a hyperbola

A

A pair of straight lines

B

An ellipse

C

A hyperbola

D

A parabola

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The correct Answer is:
D
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