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y = 3 x + 7 এ ব ং 3 y - x = 8

\tan^{- 1} (1)

\tan^{- 1} (\frac{3}{4})

\tan^{- 1} (\frac{4}{3})

\tan^{- 1} (\frac{1}{2})

ANS : 3

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