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The length of latusrectum of the parabol...

The length of latusrectum of the parabola whose parametric equations are `x=t^2+t+1,y=t^2-t+1,` where `t in R` is equal to (1) `sqrt(2)` (2) `sqrt(4)` (3) `sqrt(8)` (4) `sqrt(6)`

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