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The values of a for which (a^2-1)x^2+2(a...

The values of a for which `(a^2-1)x^2+2(a-1)x+2` is positive for all real x are

A

`a ge 1`

B

`a le1`

C

`a gt -3`

D

`a lt -3 or a gt 1`

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The correct Answer is:
D
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