The value of $c o s^{- 1} (c o s 12) - s i n^{- 1} (s i n 14)$ is

- 2

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8 π - 26

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4 π + 2

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None of these

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Solution

The correct option is D None of these
$c o s^{- 1} (c o s 12) - s i n^{- 1} (s i n 14) \Rightarrow 4 π - 12 + 5 π - 14 = 9 π - 26$

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