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

এর মান হলো-

2 \tan^{- 1} \frac{2 a}{1 + a^{2}}

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

2 \tan^{- 1} \frac{a - 2 b}{1 + 2 a b}

\tan^{- 1} \frac{a - 2 b}{1 + a b}

কোনোটিই নয়

ANS : 5

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