Let \( f(x)=\frac{e^{\tan x}-e^{x}+\ln (\sec x+\tan x)-x}{\tan x-x}...

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Let \( f(x)=\frac{e^{\tan x}-e^{x}+\ln (\sec x+\tan x)-x}{\tan x-x} \) be a continuous function at \( x=0 \). The value of
\( \mathrm{P} \) \( f(0) \) equals :

W.
(a) \( \frac{1}{2} \)
(b) \( \frac{2}{3} \)
(c) \( \frac{3}{2} \)
(d) 2
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