Find the principal value of:
$c o s^{- 1} (- 1)$

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Solution

We need to find the principal value of $c o s^{- 1} (- 1)$

Let $y = c o s^{- 1} (- 1)$

$\Rightarrow c o s y = (- 1)$

$c o s y = c o s π$

Hence the principal value of $c o s^{- 1} (- 1)$ is $π$

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