The value of $c o s^{- 1} (c o s 10)$ =

10

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4 π - 10

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2 π + 10

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2 π - 10

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Solution

The correct option is B $4 π - 10$
$c o s^{- 1} (c o s 10) = c o s^{- 1} (c o s (4 π - 10)) = 4 π - 10$

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