How do you find the exact value of $cos^-1(cos((5pi)/3))$ ?

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Answer 1 · 2016-04-11T15:50:37

$300^o$

$cos^(-1) cos x$ equals x, hence the given expression equals $(5pi)/3= 5 (180/3 degrees)= 300^o$
( $pi$ radians equal $180^o$ )

How do you find the exact value of cos^-1(cos((5pi)/3))cos^-1(cos((5pi)/3))?