The number of solutions of the equation \( \cos (\pi \sqrt{x-4}) \c...

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The number of solutions of the equation \( \cos (\pi \sqrt{x-4}) \cos (\pi \sqrt{x})=1 \) is
\( \mathrm{P} \)
(a) Zero
(b) 1
(c) 2
(d) Infinite
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