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The value of $\tan^{- 1} 1 + \tan^{- 1} 2 + \tan^{- 1} 3,$ is

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Correct option is C

We have, tan−1⁡1+tan−1⁡2+tan−1⁡3= tan−1⁡1+π+tan−1⁡2+31−2×3= tan−1⁡1+π+tan−1⁡(−1)=π

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The value of tan−1⁡1+tan−1⁡2+tan−1⁡3, is

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The value of $\tan^{- 1} 1 + \tan^{- 1} 2 + \tan^{- 1} 3,$ is