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How do you evaluate ${cos}^{- 1} (cos (\frac{9 π}{10}))$ $cos^-1(cos((9pi)/10))$ ?

1 Answer

Jul 26, 2016

$= 9 \frac{π}{10}$ $=9pi/10$

Explanation:

${cos}^{- 1} (cos (9 \frac{π}{10}))$ $cos^-1(cos(9pi/10))$
$= 9 \frac{π}{10}$ $=9pi/10$

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