The value of the integral
\[
\int_0^0 9 [x - 2\lfloor x \rfloor] \, dx
\]
where \( [.] \) denotes the greatest integer function, is
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The greatest integer function takes the integer part of the argument. When dealing with integrals involving it, break the function into intervals where the function is constant.
The value of the integral is evaluated by considering the behavior of the greatest integer function and simplifying the expression over the given range. The result is \( 0 \).