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If 'alpha' satisfies the equation x^2 - ...

If `'alpha'` satisfies the equation `x^2 - x - 2 gt 0` , then which of the following does exist ?

A

`sin^-1 alpha`

B

`sec^-1 alpha`

C

`cos^-1 alpha`

D

none of these

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The correct Answer is:
B
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