The least value of \( f(x)=\left(e^{x}+e^{-x}\right) \) is (a) \( -...

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The least value of \( f(x)=\left(e^{x}+e^{-x}\right) \) is
(a) \( -2 \)
(b) 0
(c) 2
(d) none of these
\( \mathrm{P} \)
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