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2 \tan^{- 1} \frac{1}{5} + \tan^{- 1} \frac{1}{4} = ক ত ?

\tan^{- 1} \frac{12}{13}

45^{0}

\tan^{- 1} \frac{32}{43}

60^{0}

\tan^{- 1} \frac{72}{45}

ANS : 3

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