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$C o s^{- 1} (C o s 10) =$

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4π−10

10−4π

4π+10

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detailed solution

Correct option is B

Here θ=10radians. clearly, it does not lies between 0 andπ. But 4π−10 lies between 0 and π. ∴Cos−1Cos10=Cos−1Cos4π−10 =4π−10

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Cos−1Cos​ 10=

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$C o s^{- 1} (C o s 10) =$