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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, cot 1)`

B

`( 0, tan 1)`

C

`( tan 1, infty)`

D

`( cot 1, tan1)`

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The correct Answer is:
D
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