The complete set of values of \( a \) for which the function \( f(x)=\tan ^{-1}\left(x^{2}-18 x+...

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The complete set of values of \( a \) for which the function \( f(x)=\tan ^{-1}\left(x^{2}-18 x+a\right)0 \forall x \in R \) is
(A) \( (81, \infty) \)
(B) \( [81, \infty) \)
(C) \( (-\infty, 81) \)
(D) \( (-\infty, 81] \)
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