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tan^-1(x-1)+tan^-1 x+tan^-1(x+1)=tan^-1 ...

`tan^-1(x-1)+tan^-1 x+tan^-1(x+1)=tan^-1 3x` ઉકેલગણ _______છે.

A

{1/3}

B

{1/3,-1/3}

C

`{0,1/2,-1/2}`

D

`{-1/3}`

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