Which of the following function is even function
Which of the following function is even function
- A
$f(x) = \frac{{{a^x} + 1}}{{{a^x} - 1}}$
- B
$f(x) = x\left( {\frac{{{a^x} - 1}}{{{a^x} + 1}}} \right)$
- C
$f(x) = \frac{{{a^x} - {a^{ - x}}}}{{{a^x} + {a^{ - x}}}}$
- D
$f(x) = \sin x$
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