A) \[A=\frac{1}{5},\] \[B=\frac{-2}{5\sqrt{15}},\] \[f\,\,(x)=\frac{4\,\,\tan x-3}{\sqrt{15}}\]
B) \[A=\frac{1}{5},\] \[B=\frac{1}{\sqrt{15}},\] \[f\,\,(x)=\frac{4\,\,\tan \left( \frac{x}{2} \right)+1}{\sqrt{15}}\]
C) \[A=\frac{2}{5},\] \[B=\frac{-2}{5},\] \[f\,\,(x)=\frac{4\,\,\tan x+1}{5}\]
D) \[A=\frac{2}{5},\] \[B=\frac{-2}{5\sqrt{15}},\]\[f\,\,(x)=\frac{4\,\,\tan \frac{x}{2}+1}{\sqrt{15}}\]
E) None of these
Correct Answer: D
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