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\sin^{- 1} \frac{2 a}{1 + a^{2}} - \cos^{- 1} \frac{1 - b^{2}}{1 + b^{2}} = 2 \tan^{- 1} x

হলে, x এর মান-

a + b

a - b

\frac{a - b}{1 + a b}

\frac{a + b}{1 - a b}

ANS : 3

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