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How do you simplify $cos ({cos}^{- 1} (\frac{4}{5}))$ $Cos(Cos^-1(4/5))$ ?

1 Answer

Jun 24, 2016

4/5

Explanation:

$arccos (\frac{4}{5})$ $arccos (4/5)$ --> arc x
$cos (arccos (\frac{4}{5}))$ $cos (arccos (4/5))$ = cos x = 4/5

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