The complete set of values of a for whic...

The complete set of values of a for which the function `f(x)=tan^(-1)(x^(2)-18x +a)gt 0 AA x in R` is

A

`(81, infty)`

B

`[81,infty)`

C

`(-infty,81)`

D

`(-infty,81]`

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The correct Answer is:

A

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