The number of solution of \( [\cos x]+|\sin x|=1 \) in \( \pi \leq ...

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The number of solution of \( [\cos x]+|\sin x|=1 \) in \( \pi \leq x3 \pi \) is
(a) 3
(b) 4
(c) 2
(d) 1
\( \mathrm{P} \)
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