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If x gt 0 , then tan^-1 x =...

If `x gt 0` , then `tan^-1 x =`

A

`cot^-1 x`

B

`cot^-1 (1/x)`

C

`- cot^-1 x`

D

`pi/2 - cot^-1 x`

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The correct Answer is:
B, D
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