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cot^-1((sqrt(1+x^2)-1)/x)=...

`cot^-1((sqrt(1+x^2)-1)/x)=`

A

`1/2 tan^-1 x`

B

`-1/2 tan ^-1 x`

C

`1/2 cot^-1 x`

D

`-1/2 cot^-1 x`

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