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The complete solution set of the inequal...

The complete solution set of the inequality` [cot^(-1)x]^2-6[cot^(-1)x]+9leq0` where [ ] denotes greatest integer function, is

A

`(-oo,cot 3]`

B

`[cot3, cot 2]`

C

`[cot 3,oo)`

D

None of these

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The correct Answer is:
A
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