Which of the following is an even function \( \mathrm{P} \) (1) \( ...

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Which of the following is an even function
\( \mathrm{P} \)
(1) \( x\left(\frac{a^{x}-1}{a^{x}+1}\right) \)
(2) \( \tan x \)
W
(3) \( \frac{a^{x}-a^{-x}}{2} \)
(4) \( \frac{a^{x}+1}{a^{x}-1} \)
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