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

For the curve `x = t^(2)-1, y = t^(2)-t` the tangent line is perpendicular to x-axis when

A

t = 0

B

`t = oo`

C

`t = 1/sqrt3`

D

`t = -1/sqrt3`

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A
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