For the curve x = t^2 - 1, y = t^2 - t, ...

For the curve `x = t^2 - 1, y = t^2 - t,` the tangent line is perpendicular to `x`-axis, then `t =` (i)`0` (ii)`infty` (iii) `1/(sqrt3)` (iv) `-1/(sqrt3)`

A

t=0

B

`t=infty`

C

`t=1/sqrt3`

D

`t=-1/sqrt3`

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The correct Answer is:

A

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