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$C o s^{- 1} (\frac{a - b}{a + b}) =$

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2Tan−1b

2Tan−1ba

2Tan−1ab

2Tan−1aba−b

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detailed solution

Correct option is B

Cos−11-ba1+ba=Cos−11−ba21+ba2=2Tan−1ba

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Cos−1a−ba+b=

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$C o s^{- 1} (\frac{a - b}{a + b}) =$