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If for a real number `y ,[y]` is the greatest integral function less, then or equal to `y ,` then the value of the integral `int_(pi/2)^((3pi)/2)[2sinx]dx` is `-pi` (b) 0 (c) `-pi/2` (d) `pi/2`

A

`-pi`

B

`0`

C

`(-pi)/(2)`

D

`(pi)/(2)`

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