If the function \( f(x)=2 \tan x+(2 a+1) \log _{e}|\sec x|+(a-2) x \) is increasing on \( R \), ...

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If the function \( f(x)=2 \tan x+(2 a+1) \log _{e}|\sec x|+(a-2) x \) is increasing on \( R \), then
(a) \( a \in(1 / 2, \infty) \)
(b) \( a \in(-1 / 2,1 / 2) \quad \) (c) \( a=1 / 2 \)
(d) \( a \in R \)
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