The number of values of \( x \) where the function \( f(x)=\cos x+\...

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The number of values of \( x \) where the function \( f(x)=\cos x+\cos (\sqrt{2} x) \) attains its maximum is
\( \mathrm{P} \)
(a) 0
(b) 1
W)
(c) 2
(d) Infinite
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