If \( f(x)=\lim _{n \rightarrow \infty} \sum_{r=0}^{n} \frac{\tan \frac{x}{2^{r+1}}+\tan ^{3} \f....
If \( f(x)=\lim _{n \rightarrow \infty} \sum_{r=0}^{n} \frac{\tan \frac{x}{2^{r+1}}+\tan ^{3} \frac{x}{2^{r+1}}}{1-\tan ^{2} \frac{x}{2^{r+1}}} \) then \( \lim _{x \rightarrow 0} \frac{f(x)}{x} \)
\( \mathrm{P} \)
is equal to
(1) 1
(2) 0
(3) -1
(4) None of these
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