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Question

The domain of cos1[2x23], where [.] denotes the greatest integer function, is

A
(52,12)(12,52)
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B
[52,1][1,52]
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C
(52,1][1,52)
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D
[2,1][1,2]
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Solution

The correct option is C (52,1][1,52)
For cos1 to be defined,
1[2x23]1
12x23<2
1x2<52
x(52,1][1,52)

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