Which of the following is an odd function?....

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Which of the following is an odd function?
\( \mathrm{P} \)
(1) \( f(x)=\cos x \)
(2) \( y=2^{-x^{2}} \)
W
(3) \( y=2^{x-x^{4}} \)
(4) \( y=x^{2 n} \cot ^{2 n+1} x \)


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