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Complete solution set of [cot^(-1)x]+2[t...

Complete solution set of `[cot^(-1)x]+2[tan^(-1)x]=0`, where [.] denotes the greatest integer function, is equal to

A

(0,cot1)

B

(0,tan1)

C

`(tan 1, oo)`

D

`(cot1,tan1)`

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The correct Answer is:
D
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