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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

2

B

3

C

4

D

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