A \( f{\left ( x \right )} = \frac{a^{x} + 1}{a^{x} - 1} \)
B \( f{\left ( x \right )} = x \frac{a^{x} - 1}{a^{x} + 1} \)
C \( f{\left ( x \right )} = \frac{a^{x} - a^{- x}}{a^{x} + a^{- x}} \)
D f(x) = sin x
Correct Answer: Option B
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